MC68HC705CT4 Datasheet, PDF (31/152 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification — MC68HC705CT4
Section 3. Central Processing Unit
3.1 Contents
3.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
3.3 Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
3.4 Index Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
3.5 Condition Code Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
3.6 Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.7 Program Counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.2 Introduction
The MCU contains five registers as shown in Figure 3-1. The interrupt
stacking order is shown in Figure 3-2.
7
7
12
PC
12
7
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
MC68HC705CT4 — Rev. 2.0
MOTOROLA
General Release Specification
Central Processing Unit
31
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