Datasheet

© 2007 Microchip Technology Inc. DS41213D-page 45
PIC16F5X
CALL Subroutine Call
Syntax: [ label ] CALL k
Operands: 0 ≤ k ≤ 255
Operation: (PC) + 1→ TOS;
k → PC<7:0>;
(Status<6:5>) → PC<10:9>;
0 → PC<8>
Status Affected: None
Encoding: 1001 kkkk kkkk
Description: Subroutine call. First, return
address (PC + 1) is pushed onto
the stack. The eight-bit immediate
address is loaded into PC bits
<7:0>. The upper bits PC<10:9>
are loaded from STATUS<6:5>,
PC<8> is cleared. CALL is a
two-cycle instruction.
Words: 1
Cycles: 2
Example
: HERE CALL THERE
Before Instruction
PC = address (HERE)
After Instruction
PC = address (THERE)
TOS = address (HERE + 1)
CLRF Clear f
Syntax: [ label ] CLRF f
Operands: 0 ≤ f ≤ 31
Operation: 00h → (f);
1 → Z
Status Affected: Z
Encoding: 0000 011f 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
CLRW Clear W
Syntax: [ label ] CLRW
Operands: None
Operation: 00h → (W);
1 → Z
Status Affected: Z
Encoding: 0000 0100 0000
Description: The W register is cleared. Zero bit
(Z) is set.
Words: 1
Cycles: 1
Example
: CLRW
Before Instruction
W=0x5A
After Instruction
W=0x00
Z=1
CLRWDT Clear Watchdog Timer
Syntax: [ label ] CLRWDT
Operands: None
Operation: 00h → WDT;
0 → WDT prescaler (if assigned);
1 → TO;
1 → PD
Status Affected: TO, PD
Encoding: 0000 0000 0100
Description: The CLRWDT instruction resets the
WDT. It also resets the prescaler if
the prescaler is assigned to the
WDT and not Timer0. Status bits
TO
and PD are set.
Words: 1
Cycles: 1
Example
: CLRWDT
Before Instruction
WDT counter = ?
After Instruction
WDT counter = 0x00
WDT prescaler = 0
TO
=1
PD
=1