PIC16F877-04E/P - 8-Bit 4MHz 14KB Flash MCU | Microchip
MPN: PIC16F877-04E/P ✓ Hoạt độngPIC16F877-04E/P Tóm tắt
A microcontroller is a programmable system-on-chip that integrates a CPU, memory, I/O, timers, serial interfaces, and optional analog conversion on one die. The PIC16F877 belongs to Microchip's PIC16 8-bit microcontroller family and is commonly used as the central controller in embedded products. Because the PIC16F877 combines 40 I/O lines with several dedicated peripherals, it can coordinate discrete logic, communications, timing, and analog measurements without requiring many external devices.
Verified product information identifies 14 KB of flash program memory, 368 bytes of RAM, 33 I/O, and a 4 MHz operating speed. The Microchip product page also identifies 256 bytes of EEPROM data memory, self-programming, an ICD, eight 10-bit A/D channels, two additional timers, two capture/compare/PWM functions, and a synchronous serial port configurable for SPI or I²C. These resources make the PIC16F877 suitable for legacy industrial controls, instrument panels, sensor interfaces, and compact embedded controllers.
The PIC architecture and 40-pin DIP package support straightforward breadboard prototyping and through-hole PCB assembly. The large package also exposes substantially more I/O than smaller 8-bit devices, which is useful when actuators, displays, relays, and communication peripherals cannot be multiplexed onto a small pin count. Firmware and peripheral configuration must follow the manufacturer PIC16F877 documentation rather than assuming compatibility with unrelated 8-bit MCUs.
A key design consideration is the distinction between electrical compatibility and complete drop-in equivalence. A candidate MCU may use the same 40-pin DIP outline while differing in oscillator behavior, memory map, peripherals, interrupts, timing, voltage limits, or programming interface. Before substitution, engineers should compare the exact MPN, package, pin names, maximum frequency, flash and RAM capacity, ADC behavior, timers, and serial interfaces.
This product page consolidates verified distributor and manufacturer information, a 40-pin package mapping, commercial availability details, and cautious substitution guidance. It also distinguishes verified values from parameters that were not supplied, avoiding unsupported claims and making the resulting engineering comparison easier to audit before a purchase or redesign.
Bộ thay thế dễ dàng lắp đặt cho PIC16F877-04E/P — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16F877-04E/P (cùng hình factor và footprint) — khác nhau ở Package, ADC, Mounting Type, Timers, I/O Pins.
PIC16F877-04/PQ
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Xem tài liệu →PIC16F727-I/P
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Xem tài liệu →PIC16F877-04E/P Tỷ lệ tối đa & tính chất điện
| Product Type | 8-bit CMOS flash microcontroller |
| Tần số xung maksimum | 4 MHz |
| Program Memory | 14 KB |
| Program Organization | 8K x 14 words |
| RAM | 368 bytes |
| EEPROM Data Memory | 256 bytes |
| I/O Count | 33 |
| ADC | 8-channel, 10-bit |
| Serial Port | SPI or I²C configurable synchronous serial port |
| Timer Resources | Two additional timers |
| Capture/Compare/PWM | 2 functions |
| Programming Features | Self-programming and ICD |
| Hộp | 40-pin plastic DIP (40-PDIP) |
| Mounting Technology | Through-hole |
| Temperature Grade | Extended-temperature grade |
| Trạng thái vòng đời | Active |
Cấu hình chân PIC16F877-04E/P
| Chân 1 | MCLR/VPP — Program mode select and master clear reset input |
| Chân 2 | RA0/AN0 — Port A bit 0 or analog input AN0 |
| Chân 3 | RA1/AN1 — Port A bit 1 or analog input AN1 |
| Chân 4 | RA2/AN2/VREF-/CVREF — Port A bit 2 or multiplexed analog function |
| Chân 5 | RA3/AN3/VREF+/CVREF — Port A bit 3 or multiplexed analog function |
| Chân 6 | RA4/T0CKI — Port A bit 4 or Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Port A bit 4 or multiplexed analog and SPI functions |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/CLKIN — Oscillator input or external clock input |
| Chân 10 | OSC2/CLKOUT — Oscillator output or external clock output |
| Chân 11 | RC0/T1OSO — Port C bit 0 or Timer1 oscillator output |
| Chân 12 | RC1/T1OSI/CCP2 — Port C bit 1 or Timer1 oscillator and CCP2 input |
| Chân 13 | RC2/CCP1 — Port C bit 2 or Capture/Compare/PWM pin |
| Chân 14 | RC3/SCK/SCL — Port C bit 3 or SPI clock/I²C clock |
| Chân 15 | RC4/SDI/SDA — Port C bit 4 or SPI data input/I²C data |
| Chân 16 | RC5/SDO — Port C bit 5 or SPI data output |
| Chân 17 | RC6/TX/CK — Port C bit 6 or synchronous serial transmit |
| Chân 18 | RC7/RX/DT — Port C bit 7 or synchronous serial receive |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply input |
| Chân 21 | RB0/INT — Port B bit 0 or external interrupt input |
| Chân 22 | RB1 — Port B bit 1 |
| Chân 23 | RB2 — Port B bit 2 |
| Chân 24 | RB3 — Port B bit 3 |
| Chân 25 | RB4 — Port B bit 4 |
| Chân 26 | RB5 — Port B bit 5 |
| Chân 27 | RB6/PGC — Port B bit 6 or programming clock |
| Chân 28 | RB7/PGD — Port B bit 7 or programming data |
| Chân 29 | VSS — Ground reference |
| Chân 30 | VDD — Positive supply input |
| Chân 31 | RA5 — Port A bit 5 |
| Chân 32 | RA4 — Port A bit 4 |
| Chân 33 | RA3 — Port A bit 3 |
| Chân 34 | RA2 — Port A bit 2 |
| Chân 35 | RA1 — Port A bit 1 |
| Chân 36 | RA0 — Port A bit 0 |
| Chân 37 | RB3 — Port B bit 3 |
| Chân 38 | RB2 — Port B bit 2 |
| Chân 39 | RB1 — Port B bit 1 |
| Chân 40 | RB0 — Port B bit 0 |
Ứng dụng tiêu biểu
PIC16F877-04E/P phù hợp cho 6 Áp dụngs: Legacy Industrial Control, Sensor Acquisition Panel, Instrument Control Panel, Communication Gateway, Motor and Actuator Controller, Embedded Educational and Prototype Platform.
Legacy Industrial Control
PIC16F877-04E/P fits legacy industrial control because its 33 I/O lines can connect discrete inputs, relay outputs, status indicators, and operator interfaces while the 4 MHz CPU handles supervisory logic. The 40-PDIP format simplifies repair and through-hole assembly. The eight 10-bit A/D channels and PWM-capable peripherals support basic sensing and actuator tasks, but timing margins are tighter than with faster modern MCUs. Engineers should preserve the original firmware architecture and verify supply levels, isolation requirements, isolation resistors, and environmental limits during any redesign.
Được đề xuất
Sensor Acquisition Panel
The PIC16F877-04E/P can serve as the acquisition controller for a compact sensor panel using its eight 10-bit A/D channels, 33 I/O, and configurable serial interfaces. Inputs can be sampled sequentially, filtered in firmware, and reported through SPI, I²C, or discrete outputs. The 4 MHz clock supports moderate update rates rather than high-bandwidth signal processing. Preserve adequate grounding between analog and digital circuitry, check analog input limits against the official electrical tables, and account for sensor excitation, calibration, and settling time in the acquisition schedule.
Được đề xuất
Instrument Control Panel
PIC16F877-04E/P is practical for instrument panels because 33 I/O can operate displays, keys, indicator lamps, relays, and status lines from one controller. Its 14 KB flash accommodates menu logic, calibration tables, state machines, and communication routines, while 368 bytes of RAM is sufficient for compact working sets but not large display buffers. The PIC16F877 family's ADC and serial capabilities can support analog measurement channels and host communications. Validate timing with worst-case display service routines and keep sensitive analog routing separate from switching and relay outputs.
Được đề xuất
Communication Gateway
PIC16F877-04E/P can act as a small embedded gateway when the design combines SPI or I²C local peripherals with legacy serial or discrete I/O. The configurable synchronous serial port supports 3-wire SPI and 2-wire I²C, allowing the MCU to bridge sensors, converters, EEPROMs, or display drivers while maintaining the original 40-pin controller architecture. Its 4 MHz operating speed and 14 KB flash suit modest message rates. Validate bus capacitance, pull-ups, clock stretching or transaction timing, and protocol error recovery rather than assuming compatibility with faster modern bus masters.
Được đề xuất
Motor and Actuator Controller
PIC16F877-04E/P can supervise motors and actuators through its timers, capture/compare/PWM resources, and broad I/O availability. The device is appropriate for low-to-moderate-speed control loops, position sensing, limit monitoring, and interlock logic where deterministic firmware and a stable legacy platform matter. Its 4 MHz clock and 368-byte RAM constrain very fast or highly concurrent control tasks. Use the MCU for command sequencing and supervisory functions, place power switching in external transistors or motor drivers, and provide isolation where motor transients can disturb sensitive logic.
Được đề xuất
Embedded Educational and Prototype Platform
PIC16F877-04E/P is a useful educational and prototype platform because the 40-PDIP package exposes 33 I/O, power, programming, timers, serial functions, and eight 10-bit A/D channels on an easy-to-solder footprint. Learners can implement digital I/O, PWM, counters, ADC acquisition, EEPROM storage, and SPI or I²C communication without surface-mount assembly. The 14 KB flash and 368-byte RAM make examples easy to understand. For production work, move lessons about decoupling, startup, watchdog behavior, reset pins, analog layout, and current limits directly into the PCB design rather than treating the breadboard prototype as final.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F877-04E/P — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16F877-04/P | PIC16F877-04E/PQ | PIC16F877-04/PQ | PIC16F727-I/P | PIC16F877A-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin plastic DIP (40-PDIP) | 40-pin plastic DIP (40-PDIP) | 40-pin plastic DIP (40-PDIP) | 40-pin plastic DIP (40-PDIP) | 40-pin plastic DIP (40-PDIP) | 40-pin plastic DIP (40-PDIP) |
| Temperature Grade | Extended-temperature E grade | Non-E ordering suffix | E ordering suffix | Non-E ordering suffix | I ordering suffix | I ordering suffix |
Bảo phân biệt quan trọng
- Verified 4 MHz and 14 KB flash configuration (vsPIC16F727-I/P)
- E temperature-grade designation (vsPIC16F877-04/P)
- Broad legacy-compatible 40-pin interface (vsPIC16F877A-I/P)
Ghi chú thiết kế
Start the hardware design with the exact verified VDD requirements from Microchip documentation; the supplied snippets identify the device but do not provide numeric supply-voltage or current limits. Provide local decoupling at every VDD and VSS connection, keep the return path continuous, and route high-current loads away from the MCU and analog reference circuitry. The reset and programming pins should remain accessible. Before release, measure startup current, port leakage, ADC reference behavior, and all I/O states across the intended voltage and temperature conditions.
For the 40-pin DIP footprint, preserve the standard through-hole pin numbering and verify the physical orientation with pin 1 marking and the device notch. Keep sensitive analog inputs away from relay, motor-switching, clock, and serial-drive traces. The eight 10-bit ADC channels do not eliminate layout noise: ground returns, reference routing, input filtering, and source impedance must be evaluated together. If replacing the MCU, compare the complete 40-pin signal map, including MCLR, oscillator, programming, power, and every multiplexed peripheral function.
The largest substitution risk is treating every PIC16F877 ordering code as electrically identical. The -04E/P target, -04/P, PQ, I/P, and PIC16F877A variants can differ in temperature grade, package or packing code, oscillator behavior, memory features, peripherals, or errata. A mechanical 40-pin match is not enough. Use the manufacturer ordering information and device documentation to confirm package, speed grade, temperature range, pin functions, programming, and software support before releasing a substitute to production.
Thông tin tuân thủ
The supplied verified snippets identify the manufacturer, MPN, active lifecycle information, package, memory, speed, and peripherals, but do not provide compliance declarations. No compliance status was inferred.
