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L9805E Datasheet(PDF) 104 Page - STMicroelectronics

Part # L9805E
Description  Super smart power motor driver with 8-Bit MCU, RAM, EEPROM, ADC, WDG, Timers, PWM and H-bridge driver
PDF  125 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9805E Datasheet(HTML) 104 Page - STMicroelectronics

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Instruction set
L9805E
104/125
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 subdivided in two sub-modes
called long and short:
●
Long addressing mode is more powerful because it can use the full 64Kbyte 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 (0000 - 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 optimize the use of long and short 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 16.
ST7 addressing mode overview:
Mode
Syntax
Destination
Pointer
Address
Pointer Size
(Hex.)
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
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
Long
Indirect
Indexed
ld A,([$10.w],X)
0000..FFFF
00..FF
word
+ 2



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