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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)： | 18/64頁 |
| 文件大?。?/td> | 991K |
| 代理商： | UPD7554AGA |
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18
μ
PD7554A, 7554A(A)
2.5
DATA MEMORY (RAM): 64
×
4 BITS
The data memory is a static RAM of 64 word
×
4 bits configuration. It is used as the area to store or stack processed
data. The data memory may be processed in 8-bit units when paired with the accumulator.
Fig. 2-6 Data Memory Map
( 0 ) 00H
(63) 3FH
64 Words
×
4 Bits
The data memory is addressed in the following three ways:
Direct: Direct addressing based on immediate data of an instruction
Register indirect: Indirect addressing according to the contents of the pair register HL (including automatic
incrementation and decrementation)
Stack: Indirect addressing according to the contents of the stack pointer (SP)
An arbitrary space of the data memory is available as stack memory. The boundary of the stack area is specified
when the TAMSP instruction initializes the SP. After that, the stack area is accessed automatically by the call or return
instruction.
After the call instruction is executed, the content of the PC and PSW is stored in the order shown in the following
diagram:
0
0
PC9
PC8
3
0
PSW
Note
PC3 – PC0
PC7 – PC4
SP – 4
SP – 3
SP – 2
SP – 1
Stack Area
Note
Bit 1 is fixed at 0.
When the return instruction is executed, the content of the PSW is not restored while those of the PC are restored.
Data in the data memory is retained at a low supply voltage in the STOP mode.
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