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CONTROL REGISTERS
SPH
— Stack Pointer (High Byte)
Bit Identifier
RESET Value
RESET
Read/Write
Addressing Mode
.7–.0
SPL
— Stack Pointer (Low Byte)
Bit Identifier
RESET Value
RESET
Read/Write
Addressing Mode
.7–.0
4-36
.7
.6
x
x
R/W
R/W
Register addressing mode only
Stack Pointer Address (High Byte)
The high-byte stack pointer value is the upper eight bits of the 16-bit stack pointer
address (SP15–SP8). The lower byte of the stack pointer value is located in register
SPL (D9H). The SP value is undefined following a reset.
.7
.6
x
x
R/W
R/W
Register addressing mode only
Stack Pointer Address (Low Byte)
The low-byte stack pointer value is the lower eight bits of the 16-bit stack pointer
address (SP7–SP0). The upper byte of the stack pointer value is located in register
SPH (D8H). The SP value is undefined following a reset.
S3C8248/C8245/P8245/C8247/C8249/P8249
.5
.4
x
x
R/W
R/W
R/W
.5
.4
x
x
R/W
R/W
R/W
D8H
.3
.2
.1
x
x
x
R/W
R/W
D9H
.3
.2
.1
x
x
x
R/W
R/W
Set 1
.0
x
R/W
Set 1
.0
x
R/W
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