The W741L240 is a high-performance 4-bit microcontroller (µC) that provides an LCD driver. The device contains a 4-bit ALU, a 8-bit timers, a divider, a 24 × 4 LCD driver, and three 4-bit I/O ports. There are also three interrupt sources and 8-level subroutine nesting for interrupt applications. The W741L240 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 W741L240 is suitable for caculators, simple watches and clocks, multiple I/O products, keyboard controllers, speech synthesis LSI controllers, and other products.
The W741L240 is a high‑performance 4‑bit microcontroller with an integrated LCD driver, 4‑bit ALU, 8‑bit timers, a divider, and three 4‑bit I/O ports. It operates on low voltage (1.2 V‑1.8 V) and includes power‑saving hold and stop modes, making it suitable for calculators, simple watches, keyboards, and speech‑synthesis controllers.
The handbook provides a complete functional description, including pin configuration, block diagram, memory organization, instruction set table, and details on the divider, watchdog timer, and timer/counter modules. It also lists electrical specifications, package type (64‑pin QFP), and contact information for Winbond Electronics.
| Operating voltage | 1.2 V to 1.8 V (LCD drive 3.0 V or 4.5 V) |
|---|---|
| Crystal oscillator frequency | 32.768 kHz only |
| RC oscillator maximum frequency | 1 MHz |
| Program ROM size | 2048 × 16 bit |
| Data RAM size | 64 × 4 bit |
| LCD driver RAM | 24 × 4 bits |
| I/O pins | 13 input/output pins (1 input‑only port, 2 input/output ports, 1 MFP output pin) |
| Interrupt sources | Two internal (Divider 0, Timer 1) and one external (Port RC) |
| Instruction set size | 100 instructions |
| Package type | 64‑pin QFP |
The device operates from 1.2 V to 1.8 V, with LCD driver voltages of 3.0 V or 4.5 V.
It contains a 2048 × 16‑bit program ROM, shared with a 2 K × 4‑bit look‑up table.
The microcontroller offers two internal interrupts (Divider 0 and Timer 1) and one external interrupt (Port RC).
The chip is supplied in a 64‑pin QFP package.