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ld.b [%rb]+, %rs
ld.b [%rb]-, %rs
ld.b -[%rb], %rs
Function
Signed byte data transfer with address increment/decrement option
ld.b [%rb]+, %rs (with post-increment option)
Standard)
Extension 1) B[rb] ← rs(7:0), rb(23:0) ← rb(23:0) + imm13
Extension 2) B[rb] ← rs(7:0), rb(23:0) ← rb(23:0) + imm24
ld.b [%rb]-, %rs (with post-decrement option)
Standard)
Extension 1) B[rb] ← rs(7:0), rb(23:0) ← rb(23:0) - imm13
Extension 2) B[rb] ← rs(7:0), rb(23:0) ← rb(23:0) - imm24
ld.b -[%rb], %rs (with pre-decrement option)
Standard)
Extension 1) rb(23:0) ← rb(23:0) - imm13, B[rb] ← rs(7:0)
Extension 2) rb(23:0) ← rb(23:0) - imm24, B[rb] ← rs(7:0)
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Code
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Mode
Src: Register direct %rs = %r0 to %r7
Dst: Register indirect %rb = %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
S1C17 CORE MANUAL
(Rev. 1.2)
B[rb] ← rs(7:0), rb(23:0) ← rb(23:0) + 1
B[rb] ← rs(7:0), rb(23:0) ← rb(23:0) - 1
rb(23:0) ← rb(23:0) - 1, B[rb] ← rs(7:0)
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Load instruction with post-increment option
[%rb]+,%rs
The memory address will be incremented after the data transfer has
finished.
Load instruction with post-decrement option
[%rb]-,%rs
The memory address will be decremented after the data transfer has
finished.
Load instruction with pre-decrement option
-[%rb],%rs
The memory address will be decremented before starting the data
transfer.
Seiko Epson Corporation
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1 (byte size)
7 DETAILS OF INSTRUCTIONS
ld.b
[%rb]+,%rs
ld.b
[%rb]-,%rs
ld.b
-[%rb],%rs
7-93
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