參數(shù)資料
型號: PIC16C621-20/SS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO20
封裝: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件頁數(shù): 84/121頁
文件大小: 1202K
代理商: PIC16C621-20/SS
1999 Microchip Technology Inc.
DS30235H-page 65
PIC16C62X
BTFSS
Bit Test f, Skip if Set
Syntax:
[
label ] BTFSS f,b
Operands:
0
≤ f ≤ 127
0
≤ b < 7
Operation:
skip if (f<b>) = 1
Status Affected:
None
Encoding:
01
11bb
bfff
ffff
Description:
If bit ’b’ in register ’f’ is ’1’, then the
next instruction is skipped.
If bit ’b’ is ’1’, then the next instruc-
tion fetched during the current
instruction execution, is discarded
and a NOP is executed instead,
making this a two-cycle instruction.
Words:
1
Cycles:
1(2)
Example
HERE
FALSE
TRUE
BTFSS
GOTO
FLAG,1
PROCESS_CO
DE
Before Instruction
PC =
address
HERE
After Instruction
if FLAG<1> = 0,
PC =
address FALSE
if FLAG<1> = 1,
PC =
address TRUE
CALL
Call Subroutine
Syntax:
[
label ] CALL k
Operands:
0
≤ k ≤ 2047
Operation:
(PC)+ 1
→ TOS,
k
→ PC<10:0>,
(PCLATH<4:3>)
→ PC<12:11>
Status Affected:
None
Encoding:
10
0kkk
kkkk
Description:
Call Subroutine. First, return
address (PC+1) is pushed onto
the stack. The eleven bit immedi-
ate address is loaded into PC bits
<10:0>. The upper bits of the PC
are loaded from PCLATH. CALL is
a two-cycle instruction.
Words:
1
Cycles:
2
Example
HERE
CALL
THER
E
Before Instruction
PC = Address HERE
After Instruction
PC = Address THERE
TOS = Address HERE+1
CLRF
Clear f
Syntax:
[
label ] CLRF
f
Operands:
0
≤ f ≤ 127
Operation:
00h
→ (f)
1
→ Z
Status Affected:
Z
Encoding:
00
0001
1fff
ffff
Description:
The contents of register ’f’ are
cleared and the Z bit is set.
Words:
1
Cycles:
1
Example
CLRF
FLAG_REG
Before Instruction
FLAG_REG
=
0x5A
After Instruction
FLAG_REG
=
0x00
Z=
1
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