參數(shù)資料
型號(hào): 68HC705J5A
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 23/106頁
文件大?。?/td> 1069K
代理商: 68HC705J5A
July 16, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05J5A
REV 2.1
CENTRAL PROCESSING UNIT
MOTOROLA
3-1
SECTION 3
CENTRAL PROCESSING UNIT
The MC68HC05J5A has an 4k-bytes memory map. The stack has only 64 bytes.
Therefore, 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 registers behave as described in this chapter.
3.1
REGISTERS
The MCU contains five registers which are hard-wired within the CPU and are not
part of the memory map. These five 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
6
0
A
INDEX REGISTER
7
1
X
4
5
2
3
STACK POINTER
SP
14
8
15
9
12
13
10
11
PC
CC
1
1
1
1
1
0
0
0
0
0
0
0
0
PROGRAM COUNTER
H
N
Z
C
HALF-CARRY BIT (FROM BIT 3)
INTERRUPT MASK
NEGATIVE BIT
ZERO BIT
CARRY BIT
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