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SDA55XX Datasheet, PDF (68/230 Pages) Infineon Technologies AG – Preliminary & Confidential | |||
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SDA 55xx
Preliminary & Confidential
Microcontroller
6.3
Instruction Set
The assembly language uses the same instruction set and the same instruction opcodes
as the 8051 microcomputer family.
6.3.1 Notes on Data Addressing Modes
Rn â Working register R0 â R7.
directâ 128 internal RAM-locations, any I/O-port, control or status register.
@Riâ Indirect internal RAM-location addressed by register R0 or R1.
#dataâ 8-bit constant included in instruction.
#data 16â16-bit constant included as bytes 2 & 3 of instruction.
bit â
128 software flags, any I/O-pin, control or status bit in special function
registers.
Operations working on external data memory (MOVX â¦) are used to access the
extended internal data RAM (XRAM).
6.3.2 Notes on Program Addressing Modes
addr 16â Destination address for LCALL & LJMP may be anywhere within the program
memory address space.
addr 11â Destination address for ACALL & AJMP will be within the same 2 Kbyte of the
following instruction.
rel â
SJMP and all conditional jumps include an 8-bit offset byte. Range is + 127/ â
128 bytes relative to first byte of the following instruction.
Semiconductor Group
68
Userâs Manual July 99
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