atmega103 ATMEL Corporation, atmega103 Datasheet - Page 15
atmega103
Manufacturer Part Number
atmega103
Description
Atmega103 8-bit With 128k Bytes Of In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA103.pdf
(141 pages)
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Data Indirect with Pre-
decrement
Data Indirect with Post-
increment
Constant Addressing Using
the LPM and ELPM
Instructions
0945I–AVR–02/07
Figure 14. Data Indirect Addressing with Pre-decrement
The X-, Y-, or the Z-register is decremented before the operation. Operand address is
the decremented contents of the X-, Y-, or the Z-register.
Figure 15. Data Indirect Addressing with Post-increment
The X-, Y-, or the Z-register is incremented after the operation. Operand address is the
contents of the X-, Y-, or the Z-register prior to incrementing.
Figure 16. Code Memory Constant Addressing
Constant byte address is specified by the Z-register contents. The 15 MSBs select word
address (0 - 32K), LSB selects Low Byte if cleared (LSB = 0) or High Byte if set (LSB =
15
15
15
Z-REGISTER
X-, Y- OR Z-REGISTER
X-, Y- OR Z-REGISTER
1
0
1
-1
0
0
PROGRAM MEMORY
ATmega103(L)
Data Space
Data Space
$0000
$7FFF/$FFFF
$0000
$FFFF
$0000
$FFFF
15
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