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MC81F4204D Datasheet(PDF) 43 Page - Finechips

Part No. MC81F4204D
Description  ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
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Manufacturer  FINECHIPS [Finechips]
Direct Link  http://www.finechips.com
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MC81F4204D Datasheet(HTML) 43 Page - Finechips

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MC81F4204
October 19, 2009 Ver.1.35
43
These registers also have increment, decrement, comparison and data transfer functions, and they
can be used as a simple accumulator.
SP
00H
Stack Address (00H – 0AFH)
15
8 7
0
Hardware fixed
00H – 0AFH
Stack Pointer: Stack Pointer is an 8-bit register which indicates the current
„push‟ point in the stack
area. It is used to push and pop when interrupts or general function call is occurred. Stack Pointer
identifies the location in the stack to be accessed (save or restore).
Generally, SP is automatically updated when a subroutine call is executed or an interrupt is accepted.
However, if it is used in excess of the stack area permitted by the data memory allocating
configuration, the user-processed data may be lost.
The stack can be located at any position within 00H to 0AFH of the internal data memory. The SP is
not initialized by hardware, requiring to write the initial value (the location with which the use of the
stack starts) by using the initialization routine. Normally,
the initial value of “AFH” is used.
PCH
PCL
PSW
00AF
00AE
00AD
00AC
Pop
up
At execution
of RETI instruction
00AC
00AF
PCH
PCL
PSW
00AF
00AE
00AD
00AC
Push
down
At acceptance
of interrupt
00AF
00AC
PCH
PCL
00AF
00AE
00AD
00AC
Pop
up
At execution
of RET instruction
00AD
00AF
PCH
PCL
00AF
00AE
00AD
00AC
Push
down
At execution of
A CALL/TCALL/PCALL
00AF
00AD
SP befor
execution
SP after
exccution
A
00AF
00AE
00AD
00AC
Pop
up
At execution
Of POP instruction
POP A(X,Y,PSW)
00AF
00AE
A
00AF
00AE
00AD
00AC
Push
down
At execution
Of PUSH instruction
PUSH A(X,Y,PSW)
00AF
00AE
SP befor
execution
SP after
exccution
Stack
Depth
00AF
0100
Figure 9-3 Stack Pointer
Figure 9-4 Stack Operation


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