PIC17C42A-25/PQ Microchip Technology, PIC17C42A-25/PQ Datasheet - Page 121

• Manufacturer Part Number: PIC17C42A-25/PQ
• Description: IC MCU OTP 2KX16 PWM 44-MQFP
• Manufacturer: Microchip Technology
• Series: PIC® 17Cr

Specifications of PIC17C42A-25/PQ

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: OTP
• Ram Size: 232 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-MQFP, 44-PQFP
• Processor Series: PIC17C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 232 B
• Interface Type: SCI, USART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 8
• Operating Supply Voltage: 2.5 V to 6 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: 0 C
• For Use With: AC164316 - MODULE SKT MPLAB PM3 44MQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

DECF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
1996 Microchip Technology Inc.
Before Instruction
After Instruction
Decode
CNT
Z
CNT
Z
Q1
=
=
=
=
register 'f'
Decrement f
[ label ] DECF f,d
0
d
(f) – 1
Decrement register 'f'. If 'd' is 0 the
result is stored in WREG. If 'd' is 1 the
result is stored back in register 'f'.
1
1
DECF
OV, C, DC, Z
Read
0000
Q2
0x01
0
0x00
1
f
[0,1]
255
(dest)
CNT,
011d
Execute
Q3
1
ffff
destination
Write to
Q4
ffff
DECFSZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
Before Instruction
After Instruction
Decode
PC
CNT
If CNT
If CNT
Q1
PC =
PC =
=
=
=
register 'f'
Decrement f, skip if 0
[ label ] DECFSZ f,d
0
d
(f) – 1
skip if result = 0
None
The contents of register 'f' are decre-
mented. If 'd' is 0 the result is placed in
WREG. If 'd' is 1 the result is placed
back in register 'f'.
If the result is 0, the next instruction,
which is already fetched, is discarded,
and an NOP is executed instead mak-
ing it a two-cycle instruction.
1
1(2)
HERE
CONTINUE
Read
0001
Q2
Address (HERE)
CNT - 1
0;
Address (CONTINUE)
0;
Address (HERE+1)
f
[0,1]
255
PIC17C4X
(dest);
011d
DECFSZ
GOTO
Execute
Q3
DS30412C-page 121
ffff
CNT, 1
LOOP
destination
Write to
Q4
ffff