ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 210

• Manufacturer Part Number: ST72521R9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72521R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

Instruction set
19
19.1
210/276
Instruction set
CPU addressing modes
The CPU features 17 different addressing modes which can be classified in seven main
groups as listed in the following table:
Table 116. Addressing modes
The CPU instruction set is designed to minimize the number of bytes required per
instruction: To do so, most of the addressing modes may be divided in two submodes called
long and short:
●
●
The ST7 Assembler optimizes the use of long and short addressing modes.
Table 117. CPU addressing mode overview
Inherent
Immediate
Direct
Indexed
Indirect
Relative
Bit operation
Inherent
Immediate
Short
Long
No Offset
Short
Long
Short
Long
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).
Direct
Direct
Direct
Direct
Direct
Indirect
Indirect
Indirect
Mode
Group
Indexed
Indexed
Indexed
Indexed
Doc ID 17660 Rev 1
nop
ld A,#$55
ld A,$10
ld A,$1000
ld A,(X)
ld A,($10,X)
ld A,($1000,X)
ld A,[$10]
ld A,[$10.w]
ld A,([$10],X)
Syntax
NOP
LD A,#$55
LD A,$55
LD A,($55,X)
LD A,([$55],X)
JRNE loop
BSET
00..FF
0000..FFFF
00..FF
00..1FE
0000..FFFF
00..FF
0000..FFFF
00..1FE
Destination
byte,#5
address
Pointer
00..FF
00..FF
00..FF
(Hex.)
Example
Pointer
(Hex.)
word
ST72521xx-Auto
size
byte
byte
Length
(bytes)
+ 0
+ 1
+ 1
+ 2
+ 0
+ 1
+ 2
+ 2
+ 2
+ 2