MC68HC05RC8 Datasheet, PDF (33/122 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
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.
7
7
13
PC
13
7
0 0 0 0 0 0 11
0
A
0
X
0
0
SP
CCR
H INZC
ACCUMULATOR
INDEX REGISTER
PROGRAM COUNTER
STACK POINTER
CONDITION CODE REGISTER
Figure 3-1. Programming Model
MC68HC05RC16 — Rev. 3.0
General Release Specification
Central Processor Unit
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