W541C250
DescriptionThe W541C250 is fully compatible with W741C250 in terms of pin assignment and IC function.. 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. Specifications
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) • 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) • LCD driver output − 24 segment × 4 common −Static, 1/2 duty (1/2 bias), 1/3 duty (1/2 or 1/3 bias), 1/4 duty (1/3 bias) driving mode can be selected −LCD driver output pins can be used as DC output ports; selectable by code option • MFP output pin −Output is software selectable as modulating or nonmodulating frequency −Works as frequency output specified by Timer 1 • Built-in 14-bit clock frequency divider circuit • Two built-in 8-bit programmable countdown timers −Timer 0: one of two internal clock frequencies (FOSC/4 or FOSC/1024) can be selected −Timer 1: includes an auto-reload function; and one of two internal clock frequencies (FOSC or FOSC/64) can be selected or falling edge of pin RC.0 can be selected (output through MFP pin) • Built-in 18/14-bit watchdog timer selectable for system reset • Powerful instruction set: 115 instructions • 8-level subroutine (include interrupt) nesting • Up to 1 μS instruction cycle (with 4 MHz operating frequency) • Packaged in 64-pin QFP Pinout
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