PIC16F87XA - Pin Diagrams

Oct 12, 2026

PIC16F87XA 28/40/44-pin enhanced Flash microcontrollers featuring PIC16F873A, PIC16F874A, PIC16F876A and PIC16F877A variants. The document summarizes core RISC performance, memory sizes, peripheral blocks such as timers, capture/compare/PWM, synchronous serial (SPI/I2C), and USART plus PSP where applicable. It also lists analog capabilities including 10-bit A/D up to 8 channels, comparator modules, and key reliability features like BOR, watchdog, ICSP/ICD, code protection, and power-saving sleep. Pin diagrams are provided across package formats.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages234

Reading Time9 h 50 min

AccessFree to download

Device Overview

High-Performance RISC CPU and Memory

Peripheral Features

Analog and Special Microcontroller Features

Pin Diagrams

28-Pin Packages

40-Pin Packages

44-Pin QFN

PIC16F87XA 28/40/44-Pin Enhanced Flash Microcontrollers Devices Included in this Data Sheet: • PIC16F873A • PIC16F874A • PIC16F876A • PIC16F877A High-Performance RISC CPU: • Only 35 single-word instructions to learn • All single-cycle instructions except for program branches, which are two-cycle • Operating speed: DC – 20 MHz clock input DC – 200 ns instruction cycle • Up to 8K x 14 words of Flash Program Memory, Up to 368 x 8 bytes of Data Memory (RAM), Up to 256 x 8 bytes of EEPROM Data Memory • Pinout compatible to other 28-pin or 40/44-pin PIC16CXXX and PIC16FXXX microcontrollers Peripheral Features: • Timer0: 8-bit timer/counter with 8-bit prescaler • Timer1: 16-bit timer/counter with prescaler, can be incremented during Sleep via external crystal/clock • Timer2: 8-bit timer/counter with 8-bit period register, prescaler and postscaler • Two Capture, Compare, PWM modules - Capture is 16-bit, max. resolution is 12.5 ns - Compare is 16-bit, max. resolution is 200 ns - PWM max. resolution is 10-bit • Synchronous Serial Port (SSP) with SPI (Master mode) and I2C™ (Master/Slave) • Universal Synchronous Asynchronous Receiver Transmitter (USART/SCI) with 9-bit address detection • Parallel Slave Port (PSP)– 8 bits wide with external RD, WR and CS controls (40/44-pin only) • Brown-out detection circuitry for Brown-out Reset (BOR) Analog Features: • 10-bit, up to 8-channel Analog-to-Digital Converter (A/D) • Brown-out Reset (BOR) • Analog Comparator module with: - Two analog comparators - Programmable on-chip voltage reference (VREF) module - Programmable input multiplexing from device inputs and internal voltage reference - Comparator outputs are externally accessible Special Microcontroller Features: • 100,000 erase/write cycle Enhanced Flash program memory typical • 1,000,000 erase/write cycle Data EEPROM memory typical • Data EEPROM Retention > 40 years • Self-reprogrammable under software control • In-Circuit Serial Programming™ (ICSP™) via two pins • Single-supply 5V In-Circuit Serial Programming • Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation • Programmable code protection • Power saving Sleep mode • Selectable oscillator options • In-Circuit Debug (ICD) via two pins CMOS Technology: • Low-power, high-speed Flash/EEPROM technology • Fully static design • Wide operating voltage range (2 .0V to 5 .5V) • Commercial and Industrial temperature ranges • Low-power consumption | Device | Program Memory | | Data
SRAM
(Bytes) | EEPROM
(Bytes) | I/O | 10-bit
A/D (ch) | CCP
(PWM) | MSSP | | USART | Timers
8/16-bit | Comparators | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | Bytes | \# Single Word
Instructions | | | | | | SPI | Master
I2C | | | | | | | | | | | | | | | | | | | PIC16F873A | 7.2K | 4096 | 192 | 128 | 22 | 5 | 2 | Yes | Yes | Yes | 2/1 | 2 | | PIC16F874A | 7.2K | 4096 | 192 | 128 | 33 | 8 | 2 | Yes | Yes | Yes | 2/1 | 2 | | PIC16F876A | 14.3K | 8192 | 368 | 256 | 22 | 5 | 2 | Yes | Yes | Yes | 2/1 | 2 | | PIC16F877A | 14.3K | 8192 | 368 | 256 | 33 | 8 | 2 | Yes | Yes | Yes | 2/1 | 2 | 􀂤 2001-2013 Microchip Technology Inc. DS39582C-page 1 PIC16F87XA Pin Diagrams | 28-Pin PDIP, SOIC, SSOP | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | MCLR/VPPRA0/AN0
RA1/AN1 RA2/AN2/VREF-/CVREF
RA3/AN3/VREF+ RA4/T0CKI/C1OUT RA5/AN4/SS/C2OUT VSS
OSC1/CLKI
OSC2/CLKO RC0/T1OSO/T1CKIRC1/T1OSI/CCP2 RC2/CCP1
RC3/SCK/SCL | | | 1
2
3 4
5 6
7 8
9
10
11
12
13
14
PIC16F873A/876A

28
27
26
25
24
23
22
21
20
19
18
17
16
15
| | | | RB7/PGD
RB6/PGC
RB5
RB4
RB3/PGM
RB2
RB1
RB0/INT
VDD
VSS
RC7/RX/DT
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA | | | | |

FAQs

Which microcontroller devices are included in the PIC16F87XA document?

The document includes PIC16F873A, PIC16F874A, PIC16F876A, and PIC16F877A.

What core CPU instruction performance characteristics are listed?

It specifies only 35 single-word instructions to learn, with all single-cycle instructions except for program branches that take two cycles.

What connectivity and timing peripherals are described?

It lists SPI master and I2C master/slave via the SSP, USART for serial communication, two capture/compare/PWM modules, and multiple timer options (Timer0/Timer1/Timer2) depending on device.

Oct 12, 2026

Upload by MrHarris58