W79E825A Datasheet, PDF (2/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
11.1.2 Power-On Reset (POR)................................................................................................60
11.1.3 Watchdog Timer Reset.................................................................................................60
11.2 Reset State ................................................................................................................... 60
12 INTERRUPTS ........................................................................................................................... 65
12.1 Interrupt Sources .......................................................................................................... 65
12.2 Priority Level Structure ................................................................................................. 67
12.3 Response Time............................................................................................................. 68
12.4 Interrupt Inputs.............................................................................................................. 69
13 PROGRAMMABLE TIMERS/COUNTERS ............................................................................... 71
13.1 Timer/Counters 0 & 1.................................................................................................... 71
13.1.1 Time-Base Selection ....................................................................................................71
13.1.2 Mode 0 .........................................................................................................................71
13.1.3 Mode 1 .........................................................................................................................72
13.1.4 Mode 2 .........................................................................................................................73
13.1.5 Mode 3 .........................................................................................................................73
14 NVM MEMORY ......................................................................................................................... 75
15 WATCHDOG TIMER................................................................................................................. 77
15.1 WATCHDOG CONTROL.............................................................................................. 78
15.2 CLOCK CONTROL of Watchdog.................................................................................. 79
16 SERIAL PORT (UART) ............................................................................................................. 80
16.1 MODE 0 ........................................................................................................................ 80
16.2 MODE 1 ........................................................................................................................ 81
16.3 MODE 2 ........................................................................................................................ 83
16.4 MODE 3 ........................................................................................................................ 84
16.5 Framing Error Detection ............................................................................................... 85
16.6 Multiprocessor Communications................................................................................... 85
17 TIME ACCESS PROCTECTION .............................................................................................. 87
18 KEYBOARD INTERRUPT (KBI) ............................................................................................... 89
19 ANALOG COMPARATORS ...................................................................................................... 90
20 I/O PORT CONFIGURATION ................................................................................................... 91
20.1 Quasi-Bidirectional Output Configuration ..................................................................... 91
20.2 Open Drain Output Configuration ................................................................................. 92
20.3 Push-Pull Output Configuration .................................................................................... 93
20.4 Input Only Configuration ............................................................................................... 93
21 OSCILLATOR ........................................................................................................................... 94
21.1 On-Chip RC Oscillator Option....................................................................................... 94
21.2 External Clock Input Option .......................................................................................... 95
21.3 CPU Clock Rate select ................................................................................................. 95
22 POWER MONITORING FUNCTION ........................................................................................ 96
22.1 Power On Detect........................................................................................................... 96
22.2 Brownout Detect ........................................................................................................... 96
23 PULSE-WIDTH-MODULATED (PWM) OUTPUTS ................................................................... 97
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