ST7263BK4 STMicroelectronics, ST7263BK4 Datasheet - Page 130

• Manufacturer Part Number: ST7263BK4
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 32K FLASH/ROM, DFU CAPABILITY, 8-BIT ADC, WDG, TIMER, SCI and I2C
• Manufacturer: STMicroelectronics

Specifications of ST7263BK4

• 4, 8, 16 Or 32 Kbytes Program Memory: high density Flash (HDFlash), FastROM or ROM with Read-Out and Write protection

Instruction set
12
12.1
Table 48.
130/186
Immediate
No Offset
Inherent
Short
Short
Short
Long
Long
Instruction set
ST7 addressing modes
The ST7 Core features 17 different addressing modes which can be classified in 7 main
groups:
Table 47.
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:
●
●
The ST7 Assembler optimizes the use of long and short addressing modes.
ST7 addressing mode overview
Indirect
Mode
Direct
Direct
Direct
Direct
Direct
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)
Indexed
Indexed
Indexed
Addressing modes
Addressing mode
Bit operation
Immediate
Inherent
Relative
Indexed
Indirect
Direct
ld A,($1000,X)
ld A,($10,X)
ld A,$1000
ld A,#$55
ld A,[$10]
ld A,$10
Syntax
ld A,(X)
nop
Doc ID 7516 Rev 8
Destination/
0000..FFFF
0000..FFFF
00..1FE
source
00..FF
00..FF
00..FF
address
Pointer
00..FF
ld A,([$55],X)
bset
ld A,($55,X)
ld A,#$55
ld A,$55
Example
Pointer size
jrne loop
nop
(Hex.)
byte
byte,#5
ST7263Bxx
+ 0 (with X
+ 1 (with Y
register)
register)
Length
(bytes)
+ 0
+ 1
+ 1
+ 2
+ 1
+ 2
+ 2