参数资料
型号: MC68HC05J1AVDWR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 56/126页
文件大小: 1118K
代理商: MC68HC05J1AVDWR2
Central Processor Unit (CPU)
CPU Registers
MC68HC05J1A — Rev. 1.0
Technical Data
MOTOROLA
Central Processor Unit (CPU)
35
3.3.4 Program Counter
The program counter (PC) shown in Figure 3-5 is a 16-bit register that
contains the address of the next instruction or operand to be fetched.
The five most significant bits of the program counter are ignored
internally and appear as 00000.
Normally, the address in the program counter automatically increments
to the next sequential memory location every time an instruction or
operand is fetched. Jump, branch, and interrupt operations load the
program counter with an address other than that of the next sequential
location.
Figure 3-5. Program Counter (PC)
Bit
15
14
13
12
11
10
987654321
Bit
0
Read:
00000
Write:
Reset:
00000
Loaded with vector from $07FE and $07FF
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