參數資料
型號: ST7PLU05MAE
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO8
封裝: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件頁數: 42/124頁
文件大?。?/td> 1995K
代理商: ST7PLU05MAE
Central processing unit
ST7LUS5, ST7LU05, ST7LU09
Figure 6.
CPU registers
5.3.4
Condition code register (CC)
The 8-bit condition code register contains the interrupt mask and four flags representative of
the result of 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.
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
STACK POINTER
CONDITION CODE REGISTER
PROGRAM COUNTER
70
1C
11 H I N Z
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
70
0
7
15
8
PCH
PCL
15
8 7
0
RESET VALUE = 1X
11X 1X X
RESET VALUE = XXh
X = Undefined value
RESET VALUE = STACK HIGHER ADDRESS
CC
Reset value: 111x1xxx
765
432
10
111
H
I
N
Z
C
-
R/W
Table 5.
CC register description
Bit Name
Function
7:5
-
Reserved, must remain set.
4H
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.
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