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參數(shù)資料
| 型號： | UPD7566ACS |
| 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)： | 17/58頁 |
| 文件大?。?/td> | 471K |
| 代理商： | UPD7566ACS |
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μ
PD7566A, 7566A(A)
17
2.5 DATA MEMORY (RAM)
...... 64 WORDS X 4 BITS
The data memory is static RAM configured of 64 words by 4 bits, and is used to store various data and as a stack
area. The data memory is also used in pairs with the accumulator, making it possible to process 8-bit data.
Fig. 2-6 Data Memory Map
When a return instruction has been executed, the PC contents are restored, but the PSW contents are not.
The data memory contents can be retained on a low supply voltage in the STOP mode.
3
0
0
SP - 4
SP - 3
SP - 2
SP - 1
0
PC9
PC8
PSW
Note
PC3 - PC0
PC7 - PC4
Note
Bit 1 of PSW is always 0.
(0) 00H
(63) 3FH
64 words x 4 bits
The data memory can be addressed in the following three addressing modes:
Direct: In this mode, the data memory is directly addressed by the immediate data for an instruction.
Register indirect: The data memory is indirectly addressed by the contents of pair register HL (including
autoincrement and autodecrement).
Stack: The data memory is indirectly addressed by the contents of the stack pointer (SP).
Any space in the data memory can be used as stack. The boundary of the stack is determined by initializing
the SP by TAMSP instruction. After that, the stack area is automatically accessed by call and return instructions.
When a call instruction is executed, the contents of the PC and program status word (PSW) are stored in stack,
as illustrated below.
Stack area
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相關代理商/技術參數(shù) |
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| UPD7566CS044 | 制造商:Panasonic Industrial Company 功能描述:IC |
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| 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 |
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