PIC16F818/819
FIGURE 1-1:
PIC16F818/819 BLOCK DIAGRAM
13
Program Counter
Flash
Program
Memory
1K/2K x 14
Data Bus
8
PORTA
RA0/AN0
RA1/AN1
RA2/AN2/V
REF
-
RA3/AN3/V
REF
+
RA4/AN4/T0CKI
RA5/MCLR/V
PP
RA6/OSC2/CLKO
RA7/OSC1/CLKI
PORTB
Indirect
Addr
RB0/INT
RB1/SDI/SDA
RB2/SDO/CCP1
RB3/CCP1/PGM
RB4/SCK/SCL
RB5/SS
RB6/T1OSO/T1CKI/PGC
RB7/T1OSI/PGD
8-Level Stack
(13-bit)
RAM
File
Registers
128/256 x 8
RAM Addr
(1)
9
Program
Bus
14
Instruction reg
Direct Addr
7
Addr MUX
8
FSR reg
Status reg
8
3
Power-up
Timer
Instruction
Decode &
Control
Timing
Generation
RA7/OSC1/CLKI
RA6/OSC2/CLKO
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
Brown-out
Reset
8
MUX
ALU
W reg
MCLR
V
DD
, V
SS
Timer0
Timer1
Timer2
Data EE
128/256 Bytes
10-bit, 5-channel
A/D
Synchronous
Serial Port
CCP1
Note 1:
Higher order bits are from the Status register.
DS39598E-page 6
2004 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
