W742S81A Datasheet, PDF (2/47 Pages) Winbond – 4 BIT MICROCONTROLLER

W742S81A
• LCD driver output
− 40 segments x 4 commons
− 1/4 duty 1/3 bias driving mode
− Clock source should be the sub-oscillator clock in the dual-clock operation mode
• MFP output pin
− Output is software selectable as modulating or nonmodulating frequency
− Works as frequency output specified by Timer 1
• DTMF output pin
− Output is one channel Dual Tone Multi-Frequency signal for dialling
• Two built-in 14-bit frequency dividers
− Divider0: the clock source is the output of the main-oscillator
− Divider1: the clock source is the output of the sub-oscillator (dual-clock mode) or the Fosc/128
(single-clock mode)
• Two built-in 8-bit programmable countdown timers
− Timer 0: one of two internal clock frequencies (FOSC/4 or FOSC/1024) can be selected
− Timer 1: with auto-reload function and one of three internal clock frequencies (FOSC, FOSC/64 or Fs)
can be selected by MR1 register; and the specified frequency can be delivered to MFP pin
• Built-in 18/15-bit watchdog timer selectable for system reset; enable the watch dog timer or not is
determined by code option
• Powerful instruction set
• 16-levels subroutine (include interrupt) nesting
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