PIC16F8X_13 Datasheet, PDF (59/128 Pages) Microchip Technology – 18-pin Flash/EEPROM 8-Bit Microcontrollers

PIC16F8X
BTFSS
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Bit Test f, Skip if Set
[label] BTFSS f,b
0  f  127
0b<7
skip if (f<b>) = 1
None
01 11bb bfff ffff
If bit 'b' in register 'f' is '0' then the next
instruction is executed.
If bit 'b' is '1', then the next instruction is
discarded and a NOP is executed
instead, making this a 2TCY instruction.
1
1(2)
Q1
Q2
Q3
Q4
Decode Read Process No-Operat
register 'f' data
ion
If Skip:
(2nd Cycle)
Q1
Q2
Q3
Q4
No-Operati No-Opera No-Operat
No-Operat on
tion
ion
ion
Example
HERE
FALSE
TRUE
BTFSC
GOTO
•
•
•
FLAG,1
PROCESS_CODE
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 kkkk
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. CALL
is a two cycle instruction.
Words:
1
Cycles:
2
Q Cycle Activity: Q1 Q2
Q3
Q4
1st Cycle
Decode
Read
literal 'k',
Push PC
to Stack
Process
data
Write to
PC
2nd Cycle
No-Opera No-Opera No-Operat
No-Opera tion
tion
ion
tion
Example
HERE CALL THERE
Before Instruction
PC = Address HERE
After Instruction
PC = Address THERE
TOS = Address HERE+1
 1996-2013 Microchip Technology Inc.
DS30430D-page 59