Ld.a %Rd, [%Rb] - Epson S1C17 Series Manual

7 DETAILS OF INSTRUCTIONS

ld.a %rd, [%rb]+

ld.a %rd, [%rb]-
ld.a %rd, -[%rb]
Function 32-bit data transfer with address increment/decrement option
ld.a %rd, [%rb]+ (with post-increment option)
Standard)
Extension 1) rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24), rb(23:0) ← rb(23:0) + imm13
Extension 2) rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24), rb(23:0) ← rb(23:0) + imm24
ld.a %rd, [%rb]- (with post-decrement option)
Standard)
Extension 1) rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24), rb(23:0) ← rb(23:0) - imm13
Extension 2) rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24), rb(23:0) ← rb(23:0) - imm24
ld.a %rd, -[%rb] (with pre-decrement option)
Standard)
Extension 1) rb(23:0) ← rb(23:0) - imm13, rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24)
Extension 2) rb(23:0) ← rb(23:0) - imm24, rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24)
15 14 13 12 11 10
Code
0 0 1
| |
0 0 1
| |
0 0 1
| |
IL IE C
Flag
| |
– – –
Mode Src: Register indirect %rb = %r0 to %r7
Dst: Register direct %rd = %r0 to %r7
CLK Two cycles
Description
(1) Address increment/decrement option
Specifying the []+, []-, or -[] option will automatically increment/decrement the memory
address. This allows the program to simply perform continuous data transfer.
ld.a
ld.a
ld.a
The address increment/decrement sizes are listed below.
When no ext is used (standard):
When one ext is used (extension 1): imm13
When two ext are used (extension 2): imm24
7-68
rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24), rb(23:0) ← rb(23:0) + 4
rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24), rb(23:0) ← rb(23:0) - 4
rb(23:0) ← rb(23:0) - 4, rd(23:0) ← A[rb](23:0), ignored ← A[rb](31:24)
9 8 7 6
| |
0 0 0 r d 0
| | | | |
| |
0 0 0 1
r d
| | | | |
| |
0 0 0 r d 1
| | | | |
V Z N
| | |
– – –
Load instruction with post-increment option
%rd,[%rb]+
The memory address will be incremented after the data transfer has
finished.
Load instruction with post-decrement option
%rd,[%rb]-
The memory address will be decremented after the data transfer has
finished.
Load instruction with pre-decrement option
%rd,-[%rb]
The memory address will be decremented before starting the data
transfer.
Seiko Epson Corporation
5 4 3 2 1 0
|
1 1 1 r b
| | | | |
|
1 1 1
r b
| | | | |
|
0 1 1 r b
| | | | |
4 (32-bit size)
ld.a %rd,[%rb]+
ld.a %rd,[%rb]-
ld.a %rd,-[%rb]
S1C17 CORE MANUAL
(REV. 1.2)