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參數(shù)資料
| 型號(hào)： | MC68HC05J5DW |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SOIC-20 |
| 文件頁(yè)數(shù)： | 16/69頁(yè) |
| 文件大?。?/td> | 394K |
| 代理商： | MC68HC05J5DW |
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December 11, 1996
GENERAL RELEASE SPECIFICATION
MC68HC05J5
CENTRAL PROCESSING UNIT
MOTOROLA
REV 1.1
3-1
SECTION 3
CENTRAL PROCESSING UNIT
The MC68HC05J5 has a 2K memory map. The stack has only 64 bytes. There-
fore, the stack pointer has been reduced to only 6 bits and will only decrement
down to $00C0 and then wrap-around to $00FF. All other instructions and regis-
ters behave as described in this chapter.
3.1
REGISTERS
The MCU contains ve registers which are hard-wired within the CPU and are not
part of the memory map. These ve registers are shown in Figure 3-1 and are
described in the following paragraphs.
Figure 3-1. MC68HC05 Programming Model
CONDITION CODE REGISTER
I
ACCUMULATOR
60
A
INDEX REGISTER
71
X
4
52
3
STACK POINTER
SP
14
8
15
9
12
13
10
11
PC
CC
111
11
0
PROGRAM COUNTER
HN
Z
C
HALF-CARRY BIT (FROM BIT 3)
INTERRUPT MASK
NEGATIVE BIT
ZERO BIT
CARRY BIT
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