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7 DETAILS OF INSTRUCTIONS
ld.b %rd, [%rb]+
ld.b %rd, [%rb]-
ld.b %rd, -[%rb]
Function
Signed byte data transfer with address increment/decrement option
ld.b %rd, [%rb]+ (with post-increment option)
Standard)
Extension 1) rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(24:16) ← 0, rb(23:0) ← rb(23:0) + imm13
Extension 2) rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(24:16) ← 0, rb(23:0) ← rb(23:0) + imm24
ld.b %rd, [%rb]- (with post-decrement option)
Standard)
Extension 1) rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(24:16) ← 0, rb(23:0) ← rb(23:0) - imm13
Extension 2) rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(24:16) ← 0, rb(23:0) ← rb(23:0) - imm24
ld.b %rd, -[%rb] (with pre-decrement option)
Standard)
Extension 1) rb(23:0) ← rb(23:0) - imm13, rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(24:16) ← 0
Extension 2) rb(23:0) ← rb(23:0) - imm24, rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(24:16) ← 0
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Code
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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.b
ld.b
ld.b
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
7-88
rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(23:16) ← 0, rb(23:0) ← rb(23:0) + 1
rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(23:16) ← 0, rb(23:0) ← rb(23:0) - 1
rb(23:0) ← rb(23:0) - 1, rd(7:0) ← B[rb], rd(15:8) ← B[rb](7), rd(23:16) ← 0
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–
–
–
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
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1 (byte size)
ld.b
%rd,[%rb]+
ld.b
%rd,[%rb]-
ld.b
%rd,-[%rb]
S1C17 CORE MANUAL
(REV. 1.2)
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