W921C400

The W921E400A/W921C400 is a single-chip CMOS 4-bit microcontroller that is a subset of W921E880A/W921C880. It features a 4-bit ALU, three multi-function timers, one channel DTMF generator, a beep tone generator, a serial I/O port and built in four by one channel comparator circuit, thus W921C400 can be easily implemented as telephone processor. Using the serial transmit/receive function, the W921E400A/W921C400 series can interface with Winbond LCD driver IC by the serial control circuit. There are also seven interrupt sources and 48-level subroutine nesting for interrupt applications.

The W921E400A/W921C400 have two power reduction modes, hold mode and stop mode, which help to minimize power dissipation. W921C400 is a powerful microcontroller for telephone processor, remote controllers, multiple I/O products, keyboard controllers, speech synthesis LSI controllers, and other products with few components.