參數(shù)資料
型號(hào): MC68HC705J5ACDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁(yè)數(shù): 23/106頁(yè)
文件大?。?/td> 1069K
代理商: MC68HC705J5ACDWR2
July 16, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05J5A
CENTRAL PROCESSING UNIT
MOTOROLA
REV 2.1
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 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
H
NZC
HALF-CARRY BIT (FROM BIT 3)
INTERRUPT MASK
NEGATIVE BIT
ZERO BIT
CARRY BIT
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