ST72324BK2 STMicroelectronics, ST72324BK2 Datasheet - Page 133

• Manufacturer Part Number: ST72324BK2
• Description: 5V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE
• Manufacturer: STMicroelectronics

Specifications of ST72324BK2

• Hdflash Endurance: 1 kcycle at 55 °C, data retention 40 years at 85 °C
• Clock Sources: crystal/ceramic resonator oscillators, int. RC osc. and ext. clock input
• 4 Power Saving Modes: Slow, Wait, Active-halt, and Halt

ST72324Bxx
11
11.1
Table 76.
Inherent
Immediate
Short
Long
No offset
Short
Long
Short
Long
Short
Long
Instruction set
CPU addressing modes
The CPU features 17 different addressing modes which can be classified in 7 main groups
(see
Table 75.
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.
CPU addressing mode overview
Mode
Direct
Direct
Direct
Direct
Direct
Indirect
Indirect
Indirect
Indirect
Inherent
Immediate
Direct
Indexed
Indirect
Relative
Bit operation
:
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)
Table
Indexed
Indexed
Indexed
Indexed
Indexed
75).
Addressing mode groups
Addressing mode
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)
ld A,([$10.w],X)
Syntax
00..FF
0000..FFFF
00..FF
00..1FE
0000..FFFF
00..FF
0000..FFFF
00..1FE
0000..FFFF
Destination
nop
ld A,#$55
ld A,$55
ld A,($55,X)
ld A,([$55],X)
jrne loop
bset byte,#5
Pointer address
00..FF
00..FF
00..FF
00..FF
(Hex.)
Example
Pointer size
(Hex.)
word
word
byte
byte
Instruction set
Length
(bytes)
133/193
+ 0
+ 1
+ 1
+ 2
+ 0
+ 1
+ 2
+ 2
+ 2
+ 2
+ 2