W541E261 Datasheet, PDF (3/13 Pages) Winbond – 4BIT MICROCONTROLLER, 2K ×16 ROM, 128 ×4 RAM 128 -DOT LCD

W541E/C261 DATA SHEET
2. FEATURES
• Operating voltage: 2.4V to 5.5V (LCD drive voltage: 3.0V, or 4.5V)
• Operating frequency up to 4 MHz
• Crystal/RC oscillation circuit selectable by code option for system clock
• Memory
− 2048 × 16 bit program ROM (including 2K × 4 bit look-up table)
− 128 × 4 bit data RAM (including 16 working registers)
− 32 × 4 LCD data RAM
• Single or Dual Clock Mode
− Single (main oscillator only) or dual clock (both main and sub-oscilator) by mask option .
− Dual-clock slow operation mode: system is operated by the sub-oscillator
(FOSC = Fs and Fm is stopped)
− Sub-oscillator is only 32.768 KHz crystal for dual clock mode.
− Main oscillator is crystal or RC oscillation by mask code option .
− Main clock : High-frequency clock (400 KHz to 4 MHz) or low-frequency clock (32.768 KHz) is
selected by mask code option.
• 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
• Five types of interrupts
− Four internal interrupts (Divider 0, Divider 1, Timer 0, Timer 1)
− One external interrupt (Port RC)
• LCD driver output
− 32 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
• Two built-in 14-bit clock frequency divider circuit (divider 0 and divider 1)
Publication Release Date: June 12, 2007
-3-
Revision A1