ST72264G2 STMicroelectronics, ST72264G2 Datasheet - Page 121

• Manufacturer Part Number: ST72264G2
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72264G2

• 4 K Or 8 Kbytes Program Memory: ROM or single voltage extended Flash (XFlash) with read-out protection, write protection, In-Circuit Programming and In-Application Programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt,Wait and Slow
• Two 16-bit Timers With: 2 input captures, 2 output compares, external clock input on one timer, PWM and Pulse generator modes

INSTRUCTION SET OVERVIEW (Cont’d)
12.1.1 Inherent
All Inherent instructions consist of a single byte.
The opcode fully specifies all the required informa-
tion for the CPU to process the operation.
12.1.2 Immediate
Immediate instructions have two bytes, the first
byte contains the opcode, the second byte con-
tains the operand value.
Immediate Instruction
NOP
TRAP
WFI
HALT
RET
IRET
SIM
RIM
SCF
RCF
RSP
LD
CLR
PUSH/POP
INC/DEC
TNZ
CPL, NEG
MUL
SLL, SRL, SRA, RLC,
RRC
SWAP
LD
CP
BCP
AND, OR, XOR
ADC, ADD, SUB, SBC
Inherent Instruction
No operation
S/W Interrupt
Wait For Interrupt (Low Pow-
er Mode)
Halt Oscillator (Lowest Power
Mode)
Sub-routine Return
Interrupt Sub-routine Return
Set Interrupt Mask (level 3)
Reset Interrupt Mask (level 0)
Set Carry Flag
Reset Carry Flag
Reset Stack Pointer
Load
Clear
Push/Pop to/from the stack
Increment/Decrement
Test Negative or Zero
1 or 2 Complement
Byte Multiplication
Shift and Rotate Operations
Swap Nibbles
Load
Compare
Bit Compare
Logical Operations
Arithmetic Operations
Function
Function
12.1.3 Direct
In Direct instructions, the operands are referenced
by their memory address.
The direct addressing mode consists of two sub-
modes:
Direct (short)
The address is a byte, thus requires only one byte
after the opcode, but only allows 00 - FF address-
ing space.
Direct (long)
The address is a word, thus allowing 64 Kbyte ad-
dressing space, but requires 2 bytes after the op-
code.
12.1.4 Indexed (No Offset, Short, Long)
In this mode, the operand is referenced by its
memory address, which is defined by the unsigned
addition of an index register (X or Y) with an offset.
The indirect addressing mode consists of three
sub-modes:
Indexed (No Offset)
There is no offset, (no extra byte after the opcode),
and allows 00 - FF addressing space.
Indexed (Short)
The offset is a byte, thus requires only one byte af-
ter the opcode and allows 00 - 1FE addressing
space.
Indexed (long)
The offset is a word, thus allowing 64 Kbyte ad-
dressing space and requires 2 bytes after the op-
code.
12.1.5 Indirect (Short, Long)
The required data byte to do the operation is found
by its memory address, located in memory (point-
er).
The pointer address follows the opcode. The indi-
rect addressing mode consists of two sub-modes:
Indirect (short)
The pointer address is a byte, the pointer size is a
byte, thus allowing 00 - FF addressing space, and
requires 1 byte after the opcode.
The pointer address is a byte, the pointer size is a
word, thus allowing 64 Kbyte addressing space,
and requires 1 byte after the opcode.
Indirect (long)
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