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| PIC16F87 Datasheet, PDF (8/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology | |||
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PIC16F87/88
FIGURE 1-1:
PIC16F87 DEVICE BLOCK DIAGRAM
FLASH
Program
Memory
4K x 14
Program
Bus
14
Instruction reg
13
Program Counter
Data Bus
8
8 Level Stack
(13-bit)
RAM
File
Registers
368 x 8
RAM Addr(1)
9
Addr MUX
Direct Addr 7
Indirect
8 Addr
FSR reg
STATUS reg
8
Instruction
Decode &
Control
OSC1/CLKI
OSC2/CLKO
Timing
Generation
Power-up
Timer
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
Brown-out
Reset
3
MUX
ALU
8
W reg
PORTA
PORTB
RA0/AN0
RA1/AN1
RA2/AN2/CVREF
RA3/AN3/C1OUT
RA4/T0CKI/C2OUT
RA5/MCLR/VPP
RA6/OSC2/CLKO
RA7/OSC1/CLKI
RB0/INT/CCP1(2)
RB1/SDI/SDA
RB2/SDO/RX/DT
RB3/PGM/CCP1(2)
RB4/SCK/SCL
RB5/SS/TX/CK
RB6/PGC/T1OSO/T1CKI
RB7/PGD/T1OSI
RA5/MCLR VDD, VSS
Timer2
Timer1
Timer0
SSP
USART
CCP1
Data EE
256 Bytes
Comparators
Note 1: Higher order bits are from the STATUS register.
2: The CCP1 pin is determined by CCPMX in Configuration Word 1 register.
DS30487B-page 6
Preliminary
 2003 Microchip Technology Inc.
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