Datasheet

PIC16C9XX
DS30444E - page 10  1997 Microchip Technology Inc.
FIGURE 3-1: PIC16C923 BLOCK DIAGRAM
EPROM
Program
Memory
4K x 14
13
Data Bus
8
14
Program
Bus
Instruction reg
Program Counter
8 Level Stack
(13-bit)
RAM
File
Registers
176 x 8
Direct Addr
7
RAM Addr
9
Addr MUX
Indirect
Addr
FSR reg
STATUS reg
MUX
ALU
W reg
Power-up
Timer
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
Instruction
Decode &
Control
Timing
Generation
OSC1/CLKIN
OSC2/CLKOUT
MCLR
PORTA
PORTB
PORTC
PORTD
PORTE
RA4/T0CKI
RA5/SS
RB0/INT
RB1-RB7
RC0/T1OSO/T1CKI
RC1/T1OSI
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RD0-RD4/SEGnn
RE0-RE7/SEGnn
8
8
LCD
Synchronous
Timer0
Timer1, Timer2,
RA3
RA2
RA1
RA0
CCP1
Serial Port
VLCD1
PORTF
PORTG
RF0-RF7/SEGnn
RG0-RG7/SEGnn
RD5-RD7/SEGnn/COMn
COM0
3
8
VDD, VSS
VLCD2
V
LCD3
C1
C2
VLCDADJ