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ST7FOXU0 Arkusz danych(PDF) 83 Page - STMicroelectronics

Numer części ST7FOXU0
Szczegółowy opis  1 additional output line
PDF  123 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7FOXU0 Arkusz danych(HTML) 83 Page - STMicroelectronics

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11
Instruction set
11.1
ST7 addressing modes
The ST7 core features 17 different addressing modes which can be classified in seven 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 subdivided in two submodes
called long and short:
●
Long addressing mode is more powerful because it can use the full 64 Kbyte address
space, however it uses more bytes and more CPU cycles.
●
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 instructions 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 31.
Description of addressing modes
Addressing mode
Example
Inherent
nop
Immediate
ld A,#$55
Direct
ld A,$55
Indexed
ld A,($55,X)
Indirect
ld A,([$55],X)
Relative
jrne loop
Bit operation
bset
byte,#5
Table 32.
ST7 addressing mode overview
Mode
Syntax
Destination/
source
Pointer
address
Pointer
size
Length
(bytes)
Inherent
nop
+ 0
Immediate
ld A,#$55
+ 1
Short
Direct
ld A,$10
00..FF
+ 1
Long
Direct
ld A,$1000
0000..FFFF
+ 2
No Offset
Direct
Indexed
ld A,(X)
00..FF
+ 0 (with X register)
+ 1 (with Y register)
Short
Direct
Indexed
ld A,($10,X)
00..1FE
+ 1
Long
Direct
Indexed
ld A,($1000,X)
0000..FFFF
+ 2
Short
Indirect
ld A,[$10]
00..FF
00..FF
byte
+ 2
Long
Indirect
ld A,[$10.w]
0000..FFFF
00..FF
word
+ 2
Short
Indirect
Indexed
ld A,([$10],X)
00..1FE
00..FF
byte
+ 2



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