Winbond Electronics Corporation W742C81A
The W742E81A/W742C81A is a high-performance 4-bit microcontroller (µC) that provides an LCD driver. The device contains a 4-bit ALU, two 8-bit timers, two dividers (for two oscillators) in dual- clock operation, a 40 × 4 LCD driver, six 4-bit I/O ports (including 1 output port for LED driving), and one channel DTMF generator. The W742E81A/W742C81A operates on very low current and has two power reduction modes, that is the dual-clock slow operation and STOP mode, which help to minimize power dissipation.GENERAL DESCRIPTION
4-BIT MICROCONTROLLER There are also five interrupt sources and 16-levels subroutine nesting for interrupt applications. 2.FEATURES
● Operating voltage: 2.4V−3.8V● Dual-clock operation or single-clock operation (By option)
● Main-oscillator − Connect to 3.58 MHz crystal or 400 KHz that can be selected by option code − Crystal or RC oscillator can be selected by code option (W742E81A) − Connect to 2 MHz typical RC