W741L250 Datasheet, PDF (2/86 Pages) Winbond – 4-BIT MICROCONTROLLER

W741L250
GENERAL DESCRIPTION
The W741L250 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 high sink current). There are also five interrupt sources and 8-level
subroutine nesting for interrupt applications. The W741L250 operates on very low voltage and very
low current and has two power reduction modes, hold mode and stop mode, which help to minimize
power dissipation.
The W741L250 is suitable for handheld games, watches, clocks, speech synthesis LSI controllers,
and other products.
FEATURES
• Operating voltage: 1.2V to 1.8V (LCD drive voltage: 3.0V or 4.5V)
• Operating frequency up to 1 MHz
• Crystal/RC oscillation circuit selectable by code option for system clock
• Only low-frequency clock (32.768 KHz) for crystal mode
• 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)
− MFP output pin: 1 pin (MFP)
• Power-down mode
− Hold function: no operation (except for oscillator)
− Stop function: no operation (including oscillator)
• Five types of interrupts
− Three internal interrupts (Divider 0, Timer 0, Timer 1)
− Two external interrupts (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 port by code option
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