RFPIC12C509AG Datasheet, PDF (63/104 Pages) Microchip Technology – 18/20-Pin 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter

rfPIC12C509AG/509AF
CALL
Subroutine Call
Syntax:
[ label ] CALL k
Operands:
0 ≤ k ≤ 255
Operation:
(PC) + 1→ Top of Stack;
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 STA-
TUS<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 =
Z
=
0x00
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 =
WDT prescale =
TO
=
PD
=
0x00
0
1
1
© 2001 Microchip Technology Inc.
Preliminary
DS70031A-page 61