W921E840A Datasheet, PDF (4/58 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E840A/W921C840
− PB Port: PB.0 to PB.3 open drain and pull high resistor option
− PC Port: PC.1 to PC.3 open drain and pull high resistor option
− PD Port: PD.0 to PD.1 open drain and pull high resistor option
Serial I/O Interface
• Clock synchronous multi-nibbles serial transmitter/receiver interface
DTMF Generator
• One channel DTMF generator
Beep Tone Generator
• One channel beep tone generator
8-bit D/A Converter
• One channel 8-bit D/A converter
Voltage Comparator
• Multiplexed four channel voltage comparator
Timer/Counter
• Timer 0: 2 to 19 order divider
Auto-reload timer
Watch-dog timer
• Timer 1: 2 to 19 order divider
Auto-reload timer
Arbitrary waveform generator
External event counter
• Timer 2: 2 to 19 order divider
Auto-reload timer
Arbitrary waveform generator
Period/pulse width measurement function
• Timer 3: 2 to 19 order divider
Auto-reload timer
Interrupt
• Four external sources: INT0 (P4.3), P4 Port (P4.0 to P4.2)
• Six internal sources: Timer 0, Timer 1, Timer 2, Timer 3, Comparator, Serial Port
Operating Mode (System Clock)
• Normal mode: system clock operating
• HOLD mode: no operation except for oscillator (system clock stops only)
• STOP mode: no operation including oscillator
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