
W79E804A/803A/802A
- 2 -
11.1.2
11.1.3
Reset State................................................................................................................... 57
INTERRUPTS ........................................................................................................................... 60
12.1
Interrupt Sources .......................................................................................................... 60
12.2
Priority Level Structure .................................................................................................62
12.3
Response Time.............................................................................................................63
12.4
Interrupt Inputs.............................................................................................................. 64
PROGRAMMABLE TIMERS/COUNTERS ............................................................................... 66
13.1
Timer/Counters 0 & 1....................................................................................................66
13.1.1
13.1.2
13.1.3
13.1.4
13.1.5
NVM MEMORY......................................................................................................................... 70
WATCHDOG TIMER.................................................................................................................71
15.1
WATCHDOG CONTROL..............................................................................................72
15.2
CLOCK CONTROL of Watchdog..................................................................................73
SERIAL PORT (UART).............................................................................................................74
16.1
MODE 0........................................................................................................................74
16.2
MODE 1........................................................................................................................75
16.3
MODE 2........................................................................................................................77
16.4
MODE 3........................................................................................................................78
16.5
Framing Error Detection ............................................................................................... 79
16.6
Multiprocessor Communications................................................................................... 79
TIME ACCESS PROCTECTION ..............................................................................................81
KEYBOARD INTERRUPT (KBI) ...............................................................................................83
ANALOG COMPARATORS...................................................................................................... 84
I/O PORT CONFIGURATION...................................................................................................85
20.1
Quasi-Bidirectional Output Configuration ..................................................................... 85
20.2
Open Drain Output Configuration................................................................................. 86
20.3
Push-Pull Output Configuration.................................................................................... 87
20.4
Input Only Configuration...............................................................................................87
OSCILLATOR ........................................................................................................................... 88
21.1
On-Chip RC Oscillator Option.......................................................................................88
21.2
External Clock Input Option.......................................................................................... 88
21.3
CPU Clock Rate select.................................................................................................89
POWER MONITORING FUNCTION ........................................................................................ 90
22.1
Power On Detect...........................................................................................................90
22.2
Brownout Detect ...........................................................................................................90
PULSE-WIDTH-MODULATED (PWM) OUTPUTS...................................................................91
Power-On Reset (POR)................................................................................................57
Watchdog Timer Reset.................................................................................................57
11.2
12.
13.
Time-Base Selection ....................................................................................................66
Mode 0 .........................................................................................................................66
Mode 1 .........................................................................................................................67
Mode 2 .........................................................................................................................68
Mode 3 .........................................................................................................................68
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.