PIC16F877-04E/PT Microchip Technology, PIC16F877-04E/PT Datasheet - Page 489

• Manufacturer Part Number: PIC16F877-04E/PT
• Description: IC MCU FLASH 8KX14 EE 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877-04E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC16F87704E/PT

Section 26. Watchdog Timer and Sleep Mode
Example 26-1:
Example 26-2:
1997 Microchip Technology Inc.
Changing Prescaler (Timer0 WDT)
Changing Prescaler (WDT Timer0)
To change prescaler from the WDT to the Timer0 module use the sequence shown in
Example
BSF
MOVLW
MOVWF
BCF
CLRF
BSF
MOVLW
MOVWF
CLRWDT
MOVLW
MOVWF
BCF
CLRWDT
BSF
MOVLW
MOVWF
BCF
26-2.
STATUS, RP0
B’xx0x0xxx’
OPTION_REG
STATUS, RP0
TMR0
STATUS, RP0
B’xxxx1xxx’
OPTION_REG
b'xxxx1xxx'
OPTION_REG
STATUS, RP0
STATUS, RP0
b'xxxx0xxx'
OPTION_REG
STATUS, RP0
; Bank1
; Select clock source and postscale value
;
; Bank0
; Clear TMR0 & Prescaler
; Bank1
; Select WDT, do not change prescale value
;
; Clears WDT
; Select new prescale value and WDT
;
; Bank0
; Clear WDT and postscaler
; Bank1
; Select TMR0, new prescale
; value and clock source
; Bank0
other than 1:1
DS31026A-page 26-5
26