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SAF-C161PI 데이터시트(PDF) 76 Page - Infineon Technologies AG

부품명 SAF-C161PI
상세설명  16-Bit Single-Chip Microcontroller
PDF  400 Pages
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제조업체  INFINEON [Infineon Technologies AG]
홈페이지  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

SAF-C161PI 데이터시트(HTML) 76 Page - Infineon Technologies AG

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User’s Manual
4-28
1999-08
The Stack Pointer SP
This non-bit addressable register is used to point to the top of the internal system stack
(TOS). The SP register is pre-decremented whenever data is to be pushed onto the
stack, and it is post-incremented whenever data is to be popped from the stack. Thus,
the system stack grows from higher toward lower memory locations.
Since the least significant bit of register SP is tied to ’0’ and bits 15 through 12 are tied
to ’1’ by hardware, the SP register can only contain values from F000
H to FFFEH. This
allows to access a physical stack within the internal RAM of the C161PI. A virtual stack
(usually bigger) can be realized via software. This mechanism is supported by registers
STKOV and STKUN (see respective descriptions below).
The SP register can be updated via any instruction, which is capable of modifying an SFR.
Note: Due to the internal instruction pipeline, a POP or RETURN instruction must not
immediately follow an instruction updating the SP register.
SP
Stack Pointer Register
SFR (FE12
H/09H)
Reset value: FC00
H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
11
11
sp
0
r
r
r
r
rwh
r
Bit
Function
sp
Modifiable portion of register SP
Specifies the top of the internal system stack.



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