Texas Instruments TMS320C3x User Manual
Page 592
LDP
Load Data-Page Pointer
13-134
Syntax
LDP
src, DP
Operation
src
→
data-page pointer
Operands
src is the 8 MSBs of the absolute 24-bit source address (src).
The “DP” in the operand is optional.
Opcode
31
24 23
16
8 7
0
15
0 0 0
0 1
0
0
0
0
1
1 1
0 0 0 0 0 0 0 0 0 0 0 0
src
Description
This pseudo-op is an alternate form of the LDUI instruction, except that LDP
is always in the immediate addressing mode. The
src operand field contains
the eight MSBs of the absolute 24-bit
src address (essentially, only
bits 23 –16 of
src are used). These eight bits are loaded into the eight LSBs
of the data-page pointer.
The eight LSBs of the pointer are used in direct addressing as a pointer to the
page of data being addressed. There is a total of 256 pages, each page 64K
words long. Bits 31 – 8 of the pointer are reserved and should be kept set to 0.
Cycles
1
Status Bits
LUF
Unaffected
LV
Unaffected
UF
Unaffected
N
Unaffected
Z
Unaffected
V
Unaffected
C
Unaffected
OVM
Operation is not affected by OVM bit value.
Example
LDP @809900h, DP
or
LDP @809900h
Before Instruction
After Instruction
DP
065
DP
080
LUF
0
LUF
0
LV
0
LV
0
UF
0
UF
0
N
0
N
0
Z
0
Z
0
V
0
V
0
C
0
C
0
Mode Bit