PIC16C620 Microchip Technology, PIC16C620 Datasheet - Page 65

• Manufacturer Part Number: PIC16C620
• Description: EPROM-Based 8-Bit CMOS Microcontroller
• Manufacturer: Microchip Technology

BTFSS
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example
CALL
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example
1998 Microchip Technology Inc.
Bit Test f, Skip if Set
[ label ] BTFSS f,b
0
0
skip if (f<b>) = 1
None
If bit 'b' in register 'f' is '1' then the next
instruction is skipped.
If bit 'b' is '1', then the next instruction
fetched during the current instruction
execution, is discarded and a NOP is
executed instead, making this a
two-cycle instruction.
1
1(2)
Before Instruction
After Instruction
Call Subroutine
[ label ] CALL k
0
(PC)+ 1
k
(PCLATH<4:3>)
None
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.
1
2
Before Instruction
After Instruction
HERE
FALSE
TRUE
HERE
01
10
f
b < 7
k
PC<10:0>,
127
2047
PC =
if FLAG<1> = 0,
PC =
if FLAG<1> = 1,
PC =
PC = Address HERE
PC = Address THERE
TOS = Address HERE+1
TOS,
11bb
BTFSS
GOTO
•
•
•
0kkk
CALL
address HERE
address FALSE
address TRUE
THERE
FLAG,1
PROCESS_CODE
kkkk
PC<12:11>
bfff
kkkk
ffff
Preliminary
CLRF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example
CLRW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example
Clear f
[ label ] CLRF
0
00h
1
Z
The contents of register 'f' are cleared
and the Z bit is set.
1
1
Before Instruction
After Instruction
Clear W
[ label ] CLRW
None
00h
1
Z
W register is cleared. Zero bit (Z) is
set.
1
1
Before Instruction
After Instruction
CLRF
CLRW
00
00
f
Z
Z
PIC16C62X
127
(f)
(W)
FLAG_REG
FLAG_REG
Z
W
W
Z
0001
0001
FLAG_REG
=
=
=
DS30235G-page 65
f
0x5A
0x00
1
1fff
0000
=
=
=
0x5A
0x00
1
ffff
0011