Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario Pagina 75

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7 DETAILS OF INSTRUCTIONS
S1C33 FAMILY C33 PE CORE MANUAL
EPSON
67
bclr [%rb], imm3
Function
Bit clear
Standard) B[
rb](imm3) 0
Extension 1) B[
rb + imm13](imm3) 0
Extension 2) B[
rb + imm26](imm3) 0
Code
15 12 11 8 7 4 3 2 0
1 0 1 0 1 1 0 0
r b 0 imm3
0xAC__
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Flag
IE C V Z N
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Mode
Src: Immediate data (unsigned)
Dst: Register indirect
%rb = %r0 to %r15
CLK
Three cycles (four cycles when ext is used)
Description
(1) Standard
bclr [
%rb],imm3 ; B[rb](imm3) 0
Clears a data bit of the byte data in the address specified with the rb register. The 3-bit
immediate imm3 specifies the bit number to be cleared (70).
(2) Extension 1
ext
imm13
bclr [
%rb],imm3 ; B[rb + imm13](imm3) 0
The ext instruction changes the addressing mode to register indirect addressing with
displacement. The extended instruction clears the data bit specified with the imm3 in the address
specified by adding the 13-bit immediate
imm13 to the contents of the rb register. It does not
change the contents of the rb register.
(3) Extension 2
ext
imm13 ; = imm26(25:13)
ext
imm13 ; = imm26(12:0)
bclr [
%rb],imm3 ; B[rb + imm26](imm3) 0
The ext instructions change the addressing mode to register indirect addressing with
displacement. The extended instruction clears the data bit specified with the imm3 in the address
specified by adding the 26-bit immediate
imm26 to the contents of the rb register. It does not
change the contents of the rb register.
Example
(1) ld.w %r0,[%sp+0x10] ; Sets the memory address to be accessed
; to the R0 register.
bclr [%r0],0x0 ; Clears Bit 0 of data in the specified
; address.
(2)
ext 0x1
bclr [%r0],0x7 ; Clears Bit 7 of data in the following
; address.
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