W742E81A
DESCRIPTION
4-BIT MICROCONTROLLER
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. There are also five interrupt sources and 16-levels subroutine nesting for interrupt applications. 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.
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...
