PIC16C65A Microchip Technology, PIC16C65A Datasheet - Page 147
PIC16C65A
Manufacturer Part Number
PIC16C65A
Description
8-Bit CMOS Microcontrollers
Manufacturer
Microchip Technology
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BTFSS
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example
1997 Microchip Technology Inc.
If Skip:
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 '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 2T
1
1(2)
Before Instruction
After Instruction
(2nd Cycle)
Operation
Decode
HERE
FALSE
TRUE
Q1
Q1
01
No-
f
b < 7
127
PC =
if FLAG<1> = 0,
PC =
if FLAG<1> = 1,
PC =
Operation
register 'f'
11bb
BTFSC
GOTO
•
•
•
Read
Q2
Q2
No-
address HERE
address FALSE
address TRUE
FLAG,1
PROCESS_CODE
Operation
Process
bfff
data
Q3
CY
Q3
No-
instruction.
Operation
Operation
ffff
Q4
Q4
No-
No-
CALL
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example
2nd Cycle
1st Cycle
Call Subroutine
[ label ] CALL k
0
(PC)+ 1
k
(PCLATH<4:3>)
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
None
Operation
Decode
HERE
Q1
10
No-
k
PC<10:0>,
2047
PC = Address HERE
PC = Address THERE
TOS = Address HERE+1
Operation
PIC16C6X
literal 'k',
Push PC
to Stack
0kkk
TOS,
CALL
Read
Q2
No-
DS30234D-page 147
Operation
THERE
PC<12:11>
Process
kkkk
data
Q3
No-
Operation
kkkk
Write to
Q4
No-
PC
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