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ST7LUS5 Folha de dados(PDF) 24 Page - STMicroelectronics

Nome de Peças ST7LUS5
Descrição Electrónicos  8-bit low cost, low pin-count MCU for automotive,with single voltage Flash memory, ADC, timers
PDF  124 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LUS5 Folha de dados(HTML) 24 Page - STMicroelectronics

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Central processing unit
ST7LUS5, ST7LU05, ST7LU09
24/124
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
70
70
0
7
15
8
PCH
PCL
15
8 7
0
RESET VALUE = 1X
11X 1X X
RESET VALUE = XXh
RESET VALUE = XXh
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
R/W
R/W
R/W
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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