
7 DETAILS OF INSTRUCTIONS
S1C33 FAMILY C33 PE CORE MANUAL
EPSON
113
ld.ub %rd, [%sp + imm6]
Function
Unsigned byte data transfer
Standard) rd(7:0)
← B[sp + imm6], rd(31:8) ← 0
Extension 1) rd(7:0)
← B[sp + imm19], rd(31:8) ← 0
Extension 2) rd(7:0)
← B[sp + imm32], rd(31:8) ← 0
Code
15 12 11 10 9 4 3 0
0 1 0 0 0 1
imm6 r d
0x44__
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Flag
IE C V Z N
– – – – –
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Mode
Src: Register indirect with displacement
Dst: Register direct
%rd = %r0 to %r15
CLK
Two cycles
Description
(1) Standard
ld.ub
%rd,[%sp + imm6] ; memory address = sp + imm6
The byte data in the specified memory location is transferred to the rd register after being zero-
extended to 32 bits. The content of the current SP with the 6-bit immediate imm6 added as
displacement comprises the memory address to be accessed.
(2) Extension 1
ext
imm13 ; = imm19(18:6)
ld.ub
%rd,[%sp + imm6] ; memory address = sp + imm19,
;
imm6 ← imm19(5:0)
The
ext instruction extends the displacement to a 19-bit quantity. As a result, the content of
the SP with the 19-bit immediate
imm19 added comprises the memory address, the byte data in
which is transferred to the rd register.
(3) Extension 2
ext
imm13 ; = imm32(31:19)
ext
imm13 ; = imm32(18:6)
ld.ub
%rd,[%sp + imm6] ; memory address = sp + imm32,
;
imm6 ← imm32(5:0)
The two
ext instructions extend the displacement to a 32-bit quantity. As a result, the content
of the SP with the 32-bit immediate
imm32 added comprises the memory address, the byte data
in which is transferred to the rd register.
Example
ext 0x1
ld.ub %r0,[%sp + 0x1] ; r0
← [sp + 0x41] zero-extended
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