PIC16CR83 Datasheet

  • PIC16CR83

  • 18-pin Flash/EEPROM 8-Bit Microcontrollers

  • 2018.18KB

  • 125页

  • MICROCHIP

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PIC16F8X
BTFSS
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Bit Test f, Skip if Set
[label] BTFSS f,b
0
鈮?/div>
f
鈮?/div>
127
0
鈮?/div>
b<7
skip if (f<b>) = 1
None
01
11bb
bfff
ffff
CALL
Syntax:
Operands:
Operation:
Call Subroutine
[
label
] CALL k
0
鈮?/div>
k
鈮?/div>
2047
(PC)+ 1鈫?TOS,
k
鈫?/div>
PC<10:0>,
(PCLATH<4:3>)
鈫?/div>
PC<12:11>
None
10
0kkk
kkkk
kkkk
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.
Status Affected:
Encoding:
Description:
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
CY
instruction.
Words:
Cycles:
Q Cycle Activity:
1
1(2)
Q1
Decode
Words:
Q2
Read
register 'f'
1
2
Q1
Decode
Q3
Process
data
Q4
No-Operat
ion
Cycles:
Q Cycle Activity:
1st Cycle
Q2
Read
literal 'k',
Push PC
to Stack
Q3
Process
data
Q4
Write to
PC
If Skip:
(2nd Cycle)
Q1
Q2
No-Operat
ion
Q3
Q4
2nd Cycle
No-Opera
tion
No-Operati No-Opera No-Operat
on
tion
ion
No-Opera No-Opera No-Operat
tion
tion
ion
Example
HERE
FALSE
TRUE
BTFSC
GOTO
鈥?/div>
鈥?/div>
鈥?/div>
PC =
FLAG,1
PROCESS_CODE
Example
HERE
CALL
THERE
Before Instruction
PC = Address
HERE
After Instruction
address
HERE
PC = Address
THERE
TOS = Address
HERE+1
Before Instruction
After Instruction
if FLAG<1> = 0,
PC =
address
FALSE
if FLAG<1> = 1,
PC =
address
TRUE
1998 Microchip Technology Inc.
DS30430C-page 57

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