W741E260 Datasheet, PDF (2/94 Pages) Winbond – 4-BIT FLASH MICROCONTROLLER

W741E260
GENERAL DESCRIPTION
The W741E260 is a high-performance 4-bit microcontroller (µC) that provides an LCD driver and the
flash EEPROM for the program memory. The device contains a 4-bit ALU, two 8-bit timers, two
dividers (for two oscillators) in dual-clock operation, a 32 × 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 W741E260 operates on very low current and has three power
reduction modes, hold mode and stop mode in single-clock operation and the dual-clock slow
operation, which help to minimize power dissipation.
This chip is available for W741C250 and W741C260 bodies, which can be selected by option code.
The W741E260 is suitable for end product manufacturer engineering testing and earlier samples
before mass production.
FEATURES
• Operating voltage: 2.4V to 5.5V (LCD drive voltage: 3.0V, or 4.5V)
• Crystal/Ceramic oscillator: up to 4 MHz
• RC oscillator: up to 4 MHz
• Dual-clock operation is selected by code option
• Main oscillator
− Crystal or RC oscillation circuit can be selected by code option
− In crystal mode, high-frequency (400 KHz to 4 MHz) or low-frequency (32.768 KHz) oscillation
should be selected by code option
− In RC mode, attention must be paid to the high/low frequency oscillation option, because the LCD
driver frequency and the ROM code emulation time are related to this option.
• Sub-oscillator
− Connect to 32768 Hz crystal only
− Used in dual-clock operation
• Memory
− 2048 x 16-bit program flash EEPROM (including 2K x 4-bit look-up table)
− 128 x 4-bit data RAM (including 16 working registers)
− 32 x 4 LCD data RAM
• 21 input/output pins
− Ports for input only: 2 ports/8 pins
− Input/output ports: 2 ports/8 pins
− High sink current for LED driving: 1 port/4 pins
− MFP output pin: 1 pin (MFP)
• Power-down mode
− Hold function: no operation (excluding main oscillator and sub-oscillator)
− Stop function: no operation (excluding sub-oscillator)
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