PIC12F635/PIC16F636/639
CLRWDT
Clear Watchdog Timer
BTFSS
Bit Test f, Skip if Set
Syntax:
[ label ] CLRWDT
Syntax:
[ label ] BTFSS f,b
Operands:
Operation:
None
Operands:
0 ≤ f ≤ 127
0 ≤ b < 7
00h → WDT
0→ WDT prescaler,
1→ TO
Operation:
skip if (f<b>) = 1
Status Affected: None
1→ PD
Description:
If bit ‘b’ in register ‘f’ is ‘0’, the next
instruction is executed.
Status Affected: TO, PD
Description:
CLRWDTinstruction resets the
Watchdog Timer. It also resets the
prescaler of the WDT.
If bit ‘b’ is ‘1’, then the next
instruction is discarded and a NOP
is executed instead, making this a
two-cycle instruction.
Status bits TO and PD are set.
CALL
Call Subroutine
COMF
Complement f
Syntax:
[ label ] CALL k
0 ≤ k ≤ 2047
Syntax:
[ label ] COMF f,d
Operands:
Operation:
Operands:
0 ≤ f ≤ 127
d ∈ [0,1]
(PC)+ 1→ TOS,
k → PC<10:0>,
(PCLATH<4:3>) → PC<12:11>
Operation:
(f) → (destination)
Status Affected:
Description:
Z
Status Affected: None
The contents of register ‘f’ are
complemented. If ‘d’ is ‘0’, the
result is stored in W. If ‘d’ is ‘1’,
the result is stored back in
register ‘f’.
Description:
Call Subroutine. First, return
address (PC + 1) is pushed onto
the stack. The eleven-bit
immediate address is loaded into
PC bits <10:0>. The upper bits of
the PC are loaded from PCLATH.
CALLis a two-cycle instruction.
CLRF
Clear f
DECF
Decrement f
Syntax:
[ label ] CLRF
0 ≤ f ≤ 127
f
Syntax:
[ label ] DECF f,d
Operands:
Operation:
Operands:
0 ≤ f ≤ 127
d ∈ [0,1]
00h → (f)
1→ Z
Operation:
(f) - 1 → (destination)
Status Affected:
Description:
Z
Status Affected:
Description:
Z
The contents of register ‘f’ are
cleared and the Z bit is set.
Decrement register ‘f’. If ‘d’ is ‘0’,
the result is stored in the W
register. If ‘d’ is ‘1’, the result is
stored back in register ‘f’.
CLRW
Clear W
Syntax:
[ label ] CLRW
Operands:
Operation:
None
00h → (W)
1→ Z
Status Affected:
Description:
Z
W register is cleared. Zero bit (Z)
is set.
DS41232D-page 152
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
