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參數(shù)資料
| 型號： | ST72121J4 |
| 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)： | 76/93頁 |
| 文件大?。?/td> | 915K |
| 代理商： | ST72121J4 |
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ST72E121 ST72T121
6 INSTRUCTION SET
6.1 ST7 ADDRESSING MODES
The ST7 Core features 17 different addressing
modes which can be classified in 7 main groups:
The ST7 Instruction set is designed to minimize
the number of bytes required per instruction: To do
so, most of the addressing modes may be subdi-
vided in two sub-modes called long and short:
– Long addressing mode is more powerful be-
cause it can use the full 64 Kbyte address space,
however it uses more bytes and more CPU cy-
cles.
– Short addressing mode is less powerful because
it can generally only access page zero (0000h -
00FFh range), but the instruction size is more
compact, and faster. All memory to memory in-
structions use short addressing modes only
(CLR, CPL, NEG, BSET, BRES, BTJT, BTJF,
INC, DEC, RLC, RRC, SLL, SRL, SRA, SWAP)
The ST7 Assembler optimizes the use of long and
short addressing modes.
Table 19. ST7 Addressing Mode Overview
Note
1. At the time the instruction is executed, the Program Counter (PC) points to the instruction follow-
ing JRxx.
Addressing Mode
Inherent
Immediate
Direct
Indexed
Indirect
Relative
Bit operation
Example
nop
ld A,#$55
ld A,$55
ld A,($55,X)
ld A,([$55],X)
jrne loop
bset byte,#5
Mode
Syntax
Destination/
Source
Pointer
Address
(Hex.)
Pointer
Size
(Hex.)
Length
(Bytes)
Inherent
Immediate
Short
Long
nop
ld A,#$55
ld A,$10
ld A,$1000
+ 0
+ 1
+ 1
+ 2
+ 0 (with X register)
+ 1 (with Y register)
+ 1
+ 2
+ 2
+ 2
+ 2
+ 2
+ 1
+ 2
+ 1
+ 2
+ 2
+ 3
Direct
Direct
00..FF
0000..FFFF
No Offset
Direct
Indexed
ld A,(X)
00..FF
Short
Long
Short
Long
Short
Long
Relative
Relative
Bit
Bit
Bit
Bit
Direct
Direct
Indirect
Indirect
Indirect
Indirect
Direct
Indirect
Direct
Indirect
Direct
Indirect
Indexed
Indexed
ld A,($10,X)
ld A,($1000,X)
ld A,[$10]
ld A,[$10.w]
ld A,([$10],X)
ld A,([$10.w],X)
jrne loop
jrne [$10]
bset $10,#7
bset [$10],#7
btjt $10,#7,skip
btjt [$10],#7,skip 00..FF
00..1FE
0000..FFFF
00..FF
0000..FFFF
00..1FE
0000..FFFF
PC-128/PC+127
1)
PC-128/PC+127
1)
00..FF
00..FF
00..FF
00..FF
00..FF
00..FF
00..FF
byte
word
byte
word
Indexed
Indexed
00..FF
byte
00..FF
byte
Relative
Relative
00..FF
byte
76
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