Motorola HC12 Manual De Usuario
Assembler Syntax
Source Line
MCUez HC12 Assembler
User’s Manual
MOTOROLA
Assembler Syntax
141
7.4.3.13 Indexed, Post-Increment
This addressing mode allows the user to increment the base register by a
specified value after indexing takes place. The content of the base register is
read and then incremented by the specified value.
specified value after indexing takes place. The content of the base register is
read and then incremented by the specified value.
The valid range for a pre-increment value is [1...8]. The base index register may
be X, Y, or SP.
be X, Y, or SP.
Example:
ORG $1000
CST_TBL:
DC.B $5, $10, $18, $20, $28, $30
END_TBL:
DC.B $0
main:
CLRA
CLRB
LDX #$CST_TBL
loop:
ADDD 1,X+
CPX #END_TBL
BNE loop
Base register X is loaded with the address of the table
CST_TBL
($1000).
The value at address $1000 ($5) is added to register D and then register X is
incremented by 1 (its value is $1001).
incremented by 1 (its value is $1001).
Register X is not equal to the address of
END_TBL
, so the value at address
$1001 ($10) is added to register D and then register X is incremented by 1 (its
value is $1002).
value is $1002).
This loop is repeated as long as register X did not reach the end of the table
END_TBL
($1006).