On these pages, I will explain the hardware specification of PICF877. The contents of the explanation is the part which is different from PIC16F873. So, as for the basic specification, refer to PIC16F873. As for the detailed specification, refer to PIC16F87x.
PIC16F877 is PIC which is placed in the higher rank of PIC16F873 and the capacity of the program memory and so on is big capacity compared with 873. The function which is in 877, not being in 873 is the function of the parallel communication. It is called PSP( Parallel Slave Port ). Please refer to the following table about the function and the capacity.
| RA0-5 : | Input/Output port A |
| RB0-7 : | Input/Output port B |
| RC0-7 : | Input/Output port C |
| RD0-7 : | Input/Output port D |
| RE0-2 : | Input/Output port E |
| AN0-7 : | Analog input port |
| RX : | USART Asynchronous Receive |
| TX : | USART Asynchronous Transmit |
| SCK : | Synchronous serial clock input |
| SCL : | Output for both SPI and I2C modes |
| DT : | Synchronous Data |
| CK : | Synchronous Clock |
| SDO : | SPI Data Out ( SPI mode ) |
| SDI : | SPI Data In ( SPI mode ) |
| SDA : | Data I/O ( I2C mode ) |
| CCP1,2 : | Capture In/Compare Out/PWM Out |
| OSC1/CLKIN : | Oscillator In/Ecternal Clock In |
| OSC2/CLKOUT : | Oscillator Out/Clock Out |
|
| MCLR : | Master Clear ( Active low Reset ) |
| Vpp : | Programming voltage input |
| THV : | High voltage test mode control |
| VREF+/- : | Reference voltage |
| SS : | Slave select for the synchronous serial port |
| T0CKI : | Clock input to Timer0 |
| T1OSO : | Timer1 oscillator output |
| T1OSI : | Timer1 oscillator input |
| T1CKI : | Clock input to Timer1 |
| PGD : | Serial programming data |
| PGC : | Serial programming clock |
| PGM : | Low voltage programinng input |
| INT : | External interrupt |
| RD : | Read control for the parallel slave port |
| WR : | Write control for the parallel slave port |
| CS : | Select control for the parallel slave |
| PSP0-7 : | Parallel slave port |
| VDD : | Positive supply for logic and I/O pins |
| Vss : | Ground reference for logic and I/O pins |
|
| Key Features | PIC16F873 | PIC16F874 | PIC16F876 | PIC16F877 |
| MAX Operating Frequency | 20MHz | 20MHz | 20MHz | 20MHz |
FLASH Program Memory
(14-bit words) | 4K | 4K | 8K | 8K |
| Data Memory (bytes) | 192 | 192 | 368 | 368 |
| EEPROM Data Memory (bytes) | 128 | 128 | 256 | 256 |
| I/O Ports |
RA0-5 (6)
RB0-7 (8)
RC0-7 (8) |
RA0-5 (6)
RB0-7 (8)
RC0-7 (8)
RD0-7 (8)
RE0-2 (3) |
RA0-5 (6)
RB0-7 (8)
RC0-7 (8) |
RA0-5 (6)
RB0-7 (8)
RC0-7 (8)
RD0-7 (8)
RE0-2 (3) |
| Timers | 3 | 3 | 3 | 3 |
| CCP | 2 | 2 | 2 | 2 |
| Serial Communications | MSSP, USART | MSSP, USART | MSSP, USART | MSSP, USART |
| Parallel Communications | - | PSP | - | PSP |
| 10-bit Analog-to-Digital Module | 5 Channels | 8 Channels | 5 Channels | 8 Channels |
| Instruction Set | 35 Instructions | 35 Instructions | 35 Instructions | 35 Instructions |
| Pins (DIP) | 28 Pins | 40 Pins | 28 Pins | 40 Pins |
|
Refer to the 38/200 page of the data sheet.