W921C400
Description
The W921E400A/W921C400 is a single-chip CMOS 4-bit microcontroller that is a subset of W921E880A/W921C880.
Key Features
- Operating Voltage
- 2.8 to 5.5V operating voltage for W921E400A EPROM TYPE
- 2.4 to 5.5V operating voltage for W921C400 MASK ROM TYPE Operating Frequency
- Crystal or RC for main system clock
- Crystal for 400K, 800K, 2M, 3.58M, 4 MHz - RC up to 4 MHz Memory
- 4K × 10-bit ROM (super EPROM)
- 8-bit stack pointer I/O Pins
- 13 bidirectional and individually controllable I/O lines
- Clock synchronous multi-nibbles serial transmitter/receiver interface DTMF Generator
- One channel DTMF generator Beep Tone Generator
