参数资料
型号: MC68HSC705J1ADW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 109/162页
文件大小: 3213K
代理商: MC68HSC705J1ADW
Technical Data
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
Central Processor Unit (CPU)
3.5.4 Program Counter
The program counter (PC) 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 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.
3.5.5 Condition Code Register
The condition code register (CCR) is an 8-bit register whose three most
significant bits are permanently fixed at 111. The condition code register
contains the interrupt mask and four flags that indicate the results of the
instruction just executed.
Bit
15
14
13
12
11
10
98
765
43
21
Bit
0
Read:
Write:
Reset:
0
Loaded with vector from $07FE and $07FF
Figure 3-5. Program Counter (PC)
Bit 7
6
54
32
1
Bit 0
Read:
1
HI
N
Z
C
Write:
Reset:
1
1U
U
= Unimplemented
U = Unaffected
Figure 3-6. Condition Code Register (CCR)
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For More Information On This Product,
Go to: www.freescale.com
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