W742E/C816
Deleted: SA5505
Deleted: W742C811
1. GENERAL DESCRIPTION
The W742E/C816 [W742E 816 is EEPROM type, W742C816 is mask type] is a high-performance 4-
bit microcontroller (µC) that built in 640-dot LCD driver. The device contains a 4-bit ALU, two 8-bit
timers, two dividers in dual-clock operation, a 40 × 16 LCD driver, ten 4-bit I/O ports (including 2
output port for LED driving), multiple frequency output, one channel DTMF generator and FSK
modulator of CCITT V.23 or Bellcore 202. There are also eleven interrupt sources and 16-level stack
buffer. The W742E/C816 operates on very low current and has three power reduction modes, hold
mode, stop mode and slow mode, which help to minimize power dissipation.
2. FEATURES
• Operating voltage
− 2.4V - 6.0V for mask type
− 2.4V - 4.8V for EEPROM type
• Dual-clock operation
• Main oscillator
− 3.58 MHz or 400 KHz can be selected by code option
− Crystal or RC oscillator can be selected by code option
• Sub-oscillator
− Connect to 32.768 KHz crystal only
• Memory
− 32768(32K) x 16 bit program ROM (including 64K x 4 bit look-up table)
− 5120(5K) x 4 bit data RAM (including 16 nibbles x 16 pages working registers)
− 40 x 16 LCD data RAM
• 40 input/output pins
− Port for input only: 3 ports/12 pins
− Input/output ports: 3 ports/12 pins
− High sink current output port for LED driving: 2 port /8 pins
− DC output port: 2 ports/ 8 pins (selected by code option)
• Power-down mode
− Hold mode: no operation (main oscillator and sub-oscillator still operate)
− Stop mode: no operation (main oscillator and sub-oscillator are stopped)
− Slow mode: main oscillator is stopped, system is operated by the sub-oscillator (32.768 KHz)
Publication Release Date: April 15, 2005
-3-
Revision A2