dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 657

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

ZXTA.W
Operation:
0 → D[23:16]
Description: Take the word that is located in the low-order 16 bits of the destination AGU address register, and zero
Example:
Explanation of Example:
Condition Codes Affected:
Instruction Fields:
Instruction Opcodes:
Timing:
Memory:
Freescale Semiconductor
ZXTA.W Rn
Operation
ZXTA.W
Before Execution
R2
extend it to fill all 24 bits.
ZXTA.W R2
Initially, the R2 AGU register holds the value $1283F7. After the ZXTA.W R2 instruction is executed,
zeros are replicated through the high-order 8 bits. The result is $0083F7.
The condition codes are not affected by this instruction.
1 oscillator clock cycle
1 program word
(no parallel move)
Operands
1283F7
Rn
Zero Extend Word in AGU Register
15
1
C
1
Instruction Set Details
0
; sign extend word in R2
W
1
0
Assembler Syntax:
ZXTA.W
Zero extend the value in an AGU register from bit 15
12
0
11
0
After Execution
R2
1
0
D
1
8
0083F7
Comments
7
1
(no parallel move)
0
1
0
4
ZXTA.W
R
3
0
R
A-313
R
0