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PM0044 Datasheet(PDF) 34 Page - STMicroelectronics

Part # PM0044
Description  STM8 CPU programming manual
PDF  162 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0044 Datasheet(HTML) 34 Page - STMicroelectronics

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STM8 addressing modes
PM0044
34/162
Doc ID 13590 Rev 3
Figure 7.
Immediate addressing mode example
6.3
Direct addressing mode (Short, Long, Extended)
The data byte required for the operation is found by its memory address, which follows the
op-code.
Direct addressing mode is made of three sub-modes:
Previous Value
05BE
A
PC
A6
F8
Steps to Determine
Effective Address
PC = 05BE
PC = PC + 1 = 05BF
EA = PC = 05BF
New PC = PC + 1
= 05C0
Before Completion
F8
05C0
A
New PC
A6
F8
Instruction Complete
A = (EA) = F8
New PC = 05C0
After Completion
LD A, #0F8h
05BE
05BF
05C0
05BE
05BF
05C0
VR02059A
Table 20.
Overview of Direct addressing mode instructions
Addressing mode
Syntax
EA formula
Ptr Adr
Ptr Size
Dest adr
Short
Direct
shortmem
(shortmem)
op + 1
Byte
00..FF
Long
Direct
longmem
(longmem)
op + 1..2
Word
0000..FFFF
Extended
Direct
extmem
(extmem)
op + 1..3
Ext word
000000..FFFFFF
Table 21.
Available Long and Short Direct addressing mode instructions
Instructions
Functions
LD, LDW
Load
CP
Compare
AND, OR, XOR
Logical Operations
ADC, ADD, SUB, SBC, ADDW, SUBW
Arithmetic Addition/Subtraction operations
BCP
Bit Compare



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