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| 型號(hào)： | SDA20C440 |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, MQFP-80 |
| 文件頁數(shù)： | 33/55頁 |
| 文件大?。?/td> | 990K |
| 代理商： | SDA20C440 |
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SDA 20C440
Semiconductor Group
39
2.10
Instruction Set
The assembly language uses the same instruction set and the same instruction opcodes as the
8051 microcomputer family.
2.10.1 Notes on Data Addressing Modes
A
–
Accumulator
Rn
–
Working register R0–R7.
Ra
–
Working register R0 and R1 used for indirect addressing of the RAM.
adr
–
128 internal RAM-locations, any I/O-port, control or status register.
(Ra)
–
Indirect internal RAM-location addressed by register R0 or R1.
data
–
8-bit constant included in instruction.
wadr
–
16-bit constant included as bytes 2 & 3 of instruction
bit adr
–
128 software flags and bit addressable special function register.
Operations working on external data memory (MOVX ...) are not used.
2.10.2Notes on Program Addressing Modes
wadr
–
Destination address for CALL & JP may be anywhere within the program
memory address space.
disp
–
PJP and all conditional jumps include an 8-bit offset byte. Range is + 127/
–128 bytes relative to first byte of the following instruction.
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