ST72F321J ST Microelectronics, ST72F321J Datasheet - Page 130

• Manufacturer Part Number: ST72F321J
• Description: 8-BIT MCU
• Manufacturer: ST Microelectronics

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DataSheet
ST72321J
INSTRUCTION SET OVERVIEW (Cont’d)
11.1.6 Indirect Indexed (Short, Long)
This is a combination of indirect and short indexed
addressing modes. The operand is referenced by
its memory address, which is defined by the un-
signed addition of an index register value (X or Y)
with a pointer value located in memory. The point-
er address follows the opcode.
The indirect indexed addressing mode consists of
two sub-modes:
Indirect Indexed (Short)
The pointer address is a byte, the pointer size is a
byte, thus allowing 00 - 1FE addressing space,
and requires 1 byte after the opcode.
Indirect Indexed (Long)
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.
Table 27. Instructions Supporting Direct,
Indexed,
Addressing Modes
130/179
LD
CP
AND, OR, XOR
ADC, ADD, SUB, SBC
BCP
CLR
INC, DEC
TNZ
CPL, NEG
BSET, BRES
BTJT, BTJF
SLL, SRL, SRA, RLC,
RRC
SWAP
CALL, JP
Short Instructions
4
Long and Short
Instructions
U
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Only
Indirect
and
Clear
Increment/Decrement
Test Negative or Zero
1 or 2 Complement
Bit Operations
Bit Test and Jump Opera-
tions
Shift and Rotate Opera-
tions
Swap Nibbles
Call or Jump subroutine
Load
Compare
Logical Operations
Arithmetic Additions/Sub-
stractions operations
Bit Compare
Indirect
Function
Function
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Indexed
11.1.7 Relative mode (Direct, Indirect)
This addressing mode is used to modify the PC
register value, by adding an 8-bit signed offset to
it.
The relative addressing mode consists of two sub-
modes:
Relative (Direct)
The offset is following the opcode.
Relative (Indirect)
The offset is defined in memory, which address
follows the opcode.
JRxx
CALLR
Available Relative
Direct/Indirect
Instructions
Conditional Jump
Call Relative
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