user manual

MC68HC05RC16 — Rev. 3.0 General Release Specification
MOTOROLA Central Processor Unit 33
General Release Specification — MC68HC05RC16
Section 3. Central Processor Unit
3.1 Contents
3.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
3.3 Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.4 Index Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.5 Condition Code Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
3.6 Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
3.7 Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
3.2 Introduction
This section describes the registers of the MC68HC05RC16 central
processor unit (CPU). The MCU contains five registers as shown in
Figure 3-1. The interrupt stacking order is shown in Figure 3-2.
Figure 3-1. Programming Model
A
70
X
70
HINZC
CCR
11
SP
70
PC
13
0
ACCUMULATOR
INDEX REGISTER
PROGRAM COUNTER
STACK POINTER
CONDITION CODE REGISTER
0000 0
13
0