PIC18F4431-I/P Microchip Technology Inc., PIC18F4431-I/P Datasheet - Page 309
![no-image](/images/manufacturer_photos/0/4/440/microchip_technology_inc__sml.jpg)
PIC18F4431-I/P
Manufacturer Part Number
PIC18F4431-I/P
Description
Microcontroller; 16 KB Flash; 768 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4431-IP.pdf
(396 pages)
Specifications of PIC18F4431-I/P
A/d Inputs
9-Channel, 10-Bit
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
16K Bytes
Ram Size
768 Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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DECFSZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
2003 Microchip Technology Inc.
Q Cycle Activity:
If skip:
If skip and followed by 2-word instruction:
Before Instruction
After Instruction
operation
operation
operation
Decode
No
No
No
Q1
Q1
PC
CNT
If CNT
If CNT
Q1
PC =
PC =
=
=
=
register ‘f’
operation
operation
operation
Decrement f, skip if 0
[ label ] DECFSZ f [,d [,a]]
0
d
a
(f) – 1
skip if result = 0
None
The contents of register ‘f’ are dec-
remented. If ‘d’ is 0, the result is
placed in W. If ‘d’ is 1, the result is
placed back in register ‘f’ (default).
If the result is 0, the next instruc-
tion, which is already fetched, is
discarded, and a NOP is executed
instead, making it a two-cycle
instruction. If ‘a’ is 0, the Access
Bank will be selected, overriding
the BSR value. If ‘a’ = 1, then the
bank will be selected as per the
BSR value (default).
1
1(2)
Note: 3 cycles if skip and followed
HERE
CONTINUE
Read
No
No
No
0010
Q2
Q2
Q2
Address (HERE)
CNT - 1
0;
Address (CONTINUE)
0;
Address (HERE+2)
f
[0,1]
[0,1]
255
by a 2-word instruction.
dest,
11da
operation
operation
operation
GOTO
DECFSZ
Process
Data
No
No
No
Q3
Q3
Q3
ffff
CNT
LOOP
destination
operation
operation
operation
Write to
PIC18F2331/2431/4331/4431
No
No
No
Q4
Q4
Q4
ffff
Preliminary
DCFSNZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
If skip:
If skip and followed by 2-word instruction:
Before Instruction
After Instruction
operation
operation
operation
Decode
No
No
No
TEMP
TEMP
If TEMP
If TEMP
Q1
Q1
Q1
PC
PC
register ‘f’
operation
operation
operation
Decrement f, skip if not 0
[ label ] DCFSNZ
0
d
a
(f) – 1
skip if result
None
The contents of register ‘f’ are dec-
remented. If ‘d’ is 0, the result is
placed in W. If ‘d’ is 1, the result is
placed back in register ‘f’ (default).
If the result is not 0, the next
instruction, which is already
fetched, is discarded, and a NOP is
executed instead, making it a two-
cycle instruction. If ‘a’ is 0, the
Access Bank will be selected,
overriding the BSR value. If ‘a’ = 1,
then the bank will be selected as
per the BSR value (default).
1
1(2)
Note: 3 cycles if skip and followed
HERE
ZERO
NZERO
Read
0100
No
No
No
Q2
Q2
Q2
f
[0,1]
[0,1]
255
by a 2-word instruction.
=
=
=
=
=
dest,
DCFSNZ
:
:
11da
operation
operation
operation
?
TEMP - 1,
0;
Address (ZERO)
0;
Address (NZERO)
Process
Data
0
No
No
No
Q3
Q3
Q3
DS39616B-page 307
ffff
TEMP
f [,d [,a]]
destination
operation
operation
operation
Write to
No
No
No
Q4
Q4
Q4
ffff
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