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Download TMS320C2X FIXED-POINT DSP USER'S GUIDE
Transcript
ZALH
Zero Low Accumulator and Load High Accumulator
[ label ]
[ label ]
Syntax
Direct:
Indirect:
Operands
0 ≤ dma ≤127
0 ≤ next ARP ≤ 7
(PC) + 1 → PC
0 → ACC(15–0)
(dma) → ACC(31–16)
Execution
15
14
13
12
11
10
9
8
7
Direct:
0
1
0
0
0
0
0
0
0
Data Memory Address
Indirect:
0
1
0
0
0
0
0
0
1
See Section 4.1
Encoding
Description
dma
[ {ind} [, next ARP ]
ZALH
ZALH
6
5
4
3
2
1
0
ZALH loads a data memory value into the high-order half of the accumulator.
The low-order bits of the accumulator are zeroed.
ZALH is useful for 32-bit arithmetic operations.
Words
1
Cycles
Cycle Timings for a Single Instruction
PI/DI
PI/DE
PE/DI
PE/DE
PR/DI
PR/DE
1
2+d
1+p
2+d+p
1
2+d
n
1+n+nd
n
1+n+nd
Cycle Timings for a Repeat Execution
Example
ZALH
n+p
1+n+nd+p
DAT3
;(DP = 32)
*
;If current auxiliary register contains 4099.
or
ZALH
Before Instruction
Data
Memory
4099
3F01h
ACC X
C
4-192
77FFFFh
After Instruction
Data
Memory
4099
3F01h
ACC X
3F010000h
C
Assembly Language Instructions
