- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379503 > UPD7554AGA (NEC Corp.) 4-BIT SINGLE-CHIP MICROCOMPUTER PDF資料下載
參數(shù)資料
| 型號： | UPD7554AGA |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機(jī) |
| 文件頁數(shù)： | 16/64頁 |
| 文件大?。?/td> | 991K |
| 代理商： | UPD7554AGA |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當(dāng)前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁
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 |
|---|---|
| UPD7554A | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554AA | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554ACS | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554AG | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD75CG08E | 4 BIT SINGLE CHIP CMOS MICROCOMPUTERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD7566CS044 | 制造商:Panasonic Industrial Company 功能描述:IC |
| UPD75P0016CU | 制造商:Renesas Electronics Corporation 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP |
| UPD75P0016CU-A | 制造商:Renesas Electronics Corporation 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP 制造商:Renesas Electronics 功能描述:75XL 6MHz Cut Tape 制造商:Renesas 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP |
| UPD75P0016GB-3BS-MTX | 制造商:Renesas Electronics 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP |
| UPD75P0016GB-3BS-MTX-A | 制造商:Renesas Electronics Corporation 功能描述:MCU 4-bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP 制造商:Renesas 功能描述:MCU 4-bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。