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參數(shù)資料
| 型號： | UPD7554AA |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機 |
| 文件頁數(shù)： | 16/64頁 |
| 文件大?。?/td> | 991K |
| 代理商： | UPD7554AA |
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16
μ
PD7554A, 7554A(A)
2.2
STACK POINTER (SP): 6 BITS
The stack pointer is a 6-bit register which retains head address information of the stack memory (LIFO type) which
is a part of the data memory.
Fig. 2-2 Stack Pointer Configuration
SP5
SP4
SP3
SP2
SP1
SP0
SP
The stack pointer is decremented when the call instruction is executed. It is incremented when the return
instruction is executed.
To determine the stack area, initialize the SP using the TAMSP instruction. Note that bit SP0 is loaded with 0
unconditionally when the TAMSP instruction is executed. Set the SP to the value of “the highest address of the stack
area + 1” because the stack operation starts with decrementation of the SP.
When the highest address of the stack area is 3FH which is the highest address of the data memory, the initial
value of SP5-0 must be 00H. For emulation using the
μ
PD7500H (EVAKIT-7500B), set the data to be used for AM
when executing the TAMSP instruction.
Fig. 2-3 In Execution of TAMSP Instruction
A3
A2
A1
A0
(HL)
3
(HL)
2
(HL)
1
(HL)
0
0
SP5
SP4
SP3
SP2
SP1
SP0
Note that the contents of the SP cannot be read.
Caution
Be sure to set the SP at the initial stage of the program execution because the SP becomes undefined
when the RESET signal is input.
Example
LHLI
LAI
ST
LAI
TAMSP
00H
0
4
;SP = 40H
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD7554ACS | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554AG | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD75CG08E | 4 BIT SINGLE CHIP CMOS MICROCOMPUTERS |
| UPD7508 | 4 BIT SINGLE CHIP CMOS MICROCOMPUTERS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD7554AG-597-E2 | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-597-E2-A | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-603-E2 | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-603-E2-A | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-611-E2 | 制造商:Renesas Electronics Corporation 功能描述: |
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