W541C240 Datasheet, PDF (2/10 Pages) Winbond – 4-BIT MICROCONTROLLER

W541C240
1. GENERAL DESCRIPTION
The W541C240 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
W541C240 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 W541C240 is suitable for
caculators, simple watches and clocks, multiple I/O products, keyboard controllers, speech synthesis
LSI controllers, and other products.
2. FEATURES
• Operating voltage: 2.4V to 5.5V (LCD drive voltage: 3.0V or 4.5V)
• Crystal/RC oscillation circuit selectable by code option for system clock
• Crystal oscillator: 32.768 KHz only
• RC oscillator: 1 MHz (maximum)
− High-frequency (400 KHz to 1 MHz) or low-frequency (below 400 KHz) oscillation option must
be determined by the code option.
− In RC mode, attention must be paid to the high/low frequency oscillation option, because the
LCD driver frequency is related to this option.
• Memory
− 2048 × 16 bit program ROM (shared with 2K × 4 bit look-up table)
− 64 × 4 bit data RAM (shared with 16 working registers)
− 24 × 4 LCD data RAM
• 13 input/output pins
− Ports for input only: 1 port/4 pins
− Input/output ports: 2 ports/8 pins
− 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 oscillator)
• Three types of interrupts
− Two internal interrupts (Divider 0, Timer 1)
− One external interrupts (Port RC)
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