W541C250 Datasheet, PDF (2/10 Pages) Winbond – 4-BIT MICROCONTROLLER

W541C250
1. GENERAL DESCRIPTION
The W541C250 is fully compatible with W741C250 in the terms of pin assignment and IC functon. It is
a high-performance 4-bit microcontroller (µC) that provides an LCD driver. The device contains a 4-bit
ALU, two 8-bit timers, a divider, a 24 × 4 LCD driver, and five 4-bit I/O ports (including 1 output port for
LED driving). There are also five interrupt sources and 8-level subroutine nesting for interrupt
applications. The W541C250 operates on low voltage and very low current and has two power
reduction modes, hold mode and stop mode, which help to minimize power dissipation.
The W541C250 is suitable for remote controllers, watches and clocks, multiple I/O products, keyboard
controllers, speech synthesis LSI controllers, and other products.
2. FEATURES
• Operating voltage: 2.4 ~ 5.5V (LCD drive voltage: 3.0V, or 4.5V)
• Single system clock
− Oscillation frequency up to 4 MHz , Crystal or RC oscillator is selected by mask code option ,
− High-frequency (400 KHz to 4 MHz) or low-frequency (32.768 KHz) oscillation is delected by
mask
code option
• Memory
− 2048 × 16 bit program ROM (including 2K × 4 bit look-up table)
− 128 × 4 bit data RAM (including 16 working registers)
− 24 × 4 LCD data RAM
• 21 input/output pins
− Ports for input only: 2 ports/8 pins
− Input/output ports: 2 ports/8 pins
− Port for output only: 1 port /4 pins (high sink current to drive LEDs)
− MFP output pin: 1 pin (MFP)
− Do not be floating when it is as input or output open-drain (NMOS type).
• Power-down mode
− Hold function: no operation (except for oscillator)
− Stop function: no operation (including main clock)
• Five types of interrupts
− Three internal interrupts (Divider 0, Timer 0, Timer 1)
− Two external interrupt (Port RC and INT pin)
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