16F877A B. Dring bdring@eng-serve.com 0.3 2007:08:07 (2007) B. Dring Prelimianry version...use with caution PORTA PORTB PORTC PORTD PORTE PORTB pull-ups are enabled by individual port latch values PORTB pull-ups are disabled External Interrupt on falling edge External Interrupt on rising edge A0,AN1,AN2,AN3,AN4,AN5,AN6,AN7 A0,AN1,AN2,AN4,AN5,AN6,AN7 A0,AN1,AN2,AN3,AN4 A0,AN1,AN2,AN3,AN4,AN5,AN6,AN7 A0,AN1,AN2,A4 A0,AN1,AN3 A0,AN1 None A0,AN1,AN2,AN3,AN4,AN5 A0,AN1,AN2,AN4,AN5 A0,AN1,AN4,AN5 A0,AN1,AN4 A0,AN1 A0 A0 Fosc/2 Fosc/8 Fosc/32 FRC (clock derived from the internal A/D RC oscillator) Fosc/4 Fosc/16 Fosc/64 FRC (clock derived from the internal A/D RC oscillator) Right justified. Six (6) Most Significant bits of ADRESH are read as 0 Left justified. Six (6) Least Significant bits of ADRESL are read as 0 Enable ADC Timer 0 Prescaler is assigned to the WDT Prescaler is assigned to TMR0 TMR0 Rate: 1:2 WDT Rate 1:1 TMR0 Rate: 1:4 WDT Rate 1:2 TMR0 Rate: 1:8 WDT Rate 1:4 TMR0 Rate: 1:16 WDT Rate 1:8 TMR0 Rate: 1:32 WDT Rate 1:16 TMR0 Rate: 1:64 WDT Rate 1:32 TMR0 Rate: 1:128 WDT Rate 1:64 TMR0 Rate: 1:256 WDT Rate 1:128 Timer 1 Timer On Timer Off 1:8 Prescale 1:4 Prescale 1:2 Prescale 1:1 Prescale Timer 2 Timer On Timer Off 1:1 Prescale 1:4 Prescale 1:16 Prescale 1:1 Postscale 1:2 Postscale 1:3 Postscale 1:4 Postscale 1:5 Postscale 1:6 Postscale 1:7 Postscale 1:8 Postscale 1:9 Postscale 1:10 Postscale 1:11 Postscale 1:12 Postscale 1:13 Postscale 1:14 Postscale 1:15 Postscale 1:16 Postscale CCP1 CCP1 Disabled Capture mode every falling edge Capture mode every rising edge Capture mode every 4th rising edge Capture mode every 16th rising edge Compare mode, set output on match Compare mode clear output on match Compare mode, generate interrupt on match Compare mode, trigger special event PWM Mode CCP2 CCP2 Disabled Capture mode every falling edge Capture mode every rising edge Capture mode every 4th rising edge Capture mode every 16th rising edge Compare mode, set output on match Compare mode clear output on match Compare mode, generate interrupt on match Compare mode, trigger special event PWM Mode TMR0 Overflow Interrupt RB0/INT External Interrupt RB Port Change Interrupt Parallel Slave Port Read/Write Interrupt A/D Converter Interrupt USART Receive Interrupt USART Transmit Interrupt Synchronous Serial Port (SSP) Interrupt CCP1 Interrupt TMR2 to PR2 Match Interrupt TMR1 Overflow Interrupt Comparator Interrupt EEPROM Write Operation Interrupt Bus Collision Interrupt CCP2 Interrupt