user manual

General Description
General Release Specification MC68HC05RC16 — Rev. 3.0
18 General Description MOTOROLA
Figure 1-1. MC68HC05RC16 Block Diagram
÷ 2
ACCUMULATOR
INDEX REGISTER
STACK POINTER
PROGRAM COUNTER
CONDITION CODE REGISTER
OSCILLATOR
INTERNAL
RESET
COP
CPU
M68HC05 CPU
ALU
CPU REGISTERS
CONTROL
PORT A
DATA DIRECTION REGISTER
PORT B
DATA DIRECTION REGISTER
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PROCESSOR
CLOCK
CORE TIMER
SRAM — 352 BYTES
ROM — 15,936 BYTES
SYSTEM
SYSTEM
RTI
SYSTEM
IRQ
0
0
0
0
0
0
0
1
1
1
1
1
C
Z
N
I
H
KEYSCAN PULLUPS
BURN-IN ROM — 64 BYTES
LPRST
IRO
PORT C
DATA DIRECTION REGISTER
PC0
PC1
PC2
PC3
PC4*
PC5*
PC6*
PC7*
* Marked pins are available only 44-lead PLCC package.
IRQEN
IRQEN
OSC2
V
DD
V
SS
OSC1
CARRIER
MODULATOR
TRANSMITTER