参数资料
型号: ST7FLCD1G9M1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO28
封装: ROHS COMPLIANT, SO-28
文件页数: 8/96页
文件大小: 846K
代理商: ST7FLCD1G9M1
Central Processing Unit (CPU)
ST7FLCD1
CONDITION CODE REGISTER (CC)
Read/Write
Reset Value: 111x1XXX
The 8-bit Condition Code register contains the interrupt mask and four flags resulting from the
instruction just executed. This register can also be handled by the PUSH and POP instructions.
These bits can be individually tested and/or controlled by specific instructions.
Bit 4 = H Half carry.
This bit is set by hardware when a carry occurs between bits 3 and 4 of the ALU during an ADD or
ADC instruction. It is reset by hardware during the same instructions.
0:
No half carry has occurred.
1:
A half carry has occurred.
This bit is tested using the JRH or JRNH instruction. The H bit is useful in BCD arithmetic
subroutines.
Note:
Instruction Groups are defined in Table 5.
Figure 5: CPU Registers
7
0
111
H
I
N
Z
C
Accumulator
X Index Register
Y Index Register
Stack Pointer
Condition Code Register
Program Counter
70
1C
11H I
N Z
Reset Value = Reset Vector @ FFFEh-FFFFh
70
0
7
15
8
PCH
PCL
15
8
70
Reset Value = Stack Higher Address
Reset Value =
1X
11X 1X X
Reset Value = XXh
X = Undefined Value
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