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ST7263BHx Fiches technique(PDF) 31 Page - STMicroelectronics

No de pièce ST7263BHx
Description  Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI and I²C
PDF  186 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7263BHx Fiches technique(HTML) 31 Page - STMicroelectronics

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ST7263Bxx
Central processing unit
Doc ID 7516 Rev 8
31/186
pointed to by the SP. Then the other registers are stored in the next locations as shown in
Figure 10.
●
When an interrupt is received, the SP is decremented and the context is pushed on the
stack.
●
On return from interrupt, the SP is incremented and the context is popped from the
stack.
A subroutine call occupies two locations and an interrupt five locations in the stack area.
Figure 10.
Stack manipulation example
Figure 11.
CPU registers
PCH
PCL
SP
PCH
PCL
SP
PCL
PCH
X
A
CC
PCH
PCL
SP
PCL
PCH
X
A
CC
PCH
PCL
SP
PCL
PCH
X
A
CC
PCH
PCL
SP
SP
Y
CALL
Subroutine
Interrupt
Event
PUSH Y
POP Y
IRET
RET
or RSP
@ 017Fh
@ 0100h
Stack Higher Address = 017Fh
Stack Lower Address = 0100h
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
STACK POINTER
CONDITION CODE REGISTER
PROGRAM COUNTER
70
1C
1 1 HI
NZ
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
70
70
70
0
7
15
8
PCH
PCL
15
8
70
RESET VALUE = STACK HIGHER ADDRESS
RESET VALUE = 1X
11 X 1 X X
RESET VALUE = XXh
RESET VALUE = XXh
RESET VALUE = XXh
X = undefined value



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