參數(shù)資料
型號: ST72121J2
元件分類: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁數(shù): 78/93頁
文件大?。?/td> 915K
代理商: ST72121J2
78/93
ST72E121 ST72T121
ST7 ADDRESSING MODES
(Cont’d)
6.1.6 Indirect Indexed (Short, Long)
This is a combination of indirect and short indexed
addressing modes. The operand is referenced by
its memory address, which is defined by the un-
signed addition of an index register value (X or Y)
with a pointer value located in memory. The point-
er address follows the opcode.
The indirect indexed addressing mode consists of
two sub-modes:
Indirect Indexed (Short)
The pointer address is a byte, the pointer size is a
byte, thus allowing 00 - 1FE addressing space,
and requires 1 byte after the opcode.
Indirect Indexed (Long)
The pointer address is a byte, the pointer size is a
word, thus allowing 64 Kbyte addressing space,
and requires 1 byte after the opcode.
Table 20. Instructions Supporting Direct,
Indexed,
Indirect
and
Addressing Modes
Indirect
Indexed
6.1.7 Relative Mode (Direct, Indirect)
This addressing mode is used to modify the PC
register value by adding an 8-bit signed offset to it.
The relative addressing mode consists of two sub-
modes:
Relative (Direct)
The offset follows the opcode.
Relative (Indirect)
The offset is defined in memory, of which the ad-
dress follows the opcode.
Long and Short
Instructions
Function
LD
CP
AND, OR, XOR
Load
Compare
Logical Operations
Arithmetic Addition/subtrac-
tion operations
Bit Compare
ADC, ADD, SUB, SBC
BCP
Short Instructions Only
CLR
INC, DEC
TNZ
CPL, NEG
BSET, BRES
Function
Clear
Increment/Decrement
Test Negative or Zero
1 or 2 Complement
Bit Operations
Bit Test and Jump Opera-
tions
BTJT, BTJF
SLL, SRL, SRA, RLC,
RRC
Shift and Rotate Operations
SWAP
CALL, JP
Swap Nibbles
Call or Jump subroutine
Available Relative Direct/
Indirect Instructions
JRxx
CALLR
Function
Conditional Jump
Call Relative
78
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