W742E81A - Brand New IC Chips
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Description
The W742E81A/W742C81A is a high-performance 4-bit microcontroller (mC) that provides an LCD driver. The device contains a 4-bit ALU, two 8-bit timers, two dividers (for two oscillators) in dual clock operation, a 40 ´ 4 LCD driver, six 4-bit I/O ports (including 1 output port for LED driving), and one channel DTMF generator. There are also five interrupt sources and 16-levels subroutine nesting for interrupt applications. The W742E81A/W742C81A operates on very low current and has two power reduction modes, that is the dual-clock slow operation and STOP mode, which help to minimize power dissipation.
Specifications and features
- Operating voltage: 2.4V-3.8V
- Dual-clock operation or single-clock operation (By option)
- Main-oscillator
- - Connect to 3.58 MHz crystal or 400 KHz that can be selected by option code
- - Crystal or RC oscillator can be selected by code option (W742E81A)
- - Connect to 2 MHz typical RC oscillator (W742C81A)
- Sub-oscillator
- - Connect to 32768 Hz crystal only
- Memory
- - 16384 x 16 bits program flash EEPROM (including 64K x 4 bit look-up table)
- - 2048 x 4 bits data RAM (including 16 nibbles x 16 pages working registers)
- - 40 x 4 LCD data RAM
- 24 input/output pins
- - Port for input only: 1 ports/4 pins(RC)
- - Input/output ports: 3 ports/12 pins(RA, RB & RD)
- - High sink current output port for LED driving: 1 port /4 pins(RE)
- - Port for output only: 1 port/ 4 pins(RF)
- Power-down mode
- - Hold function: no operation (main-oscillator and sub-oscillator still operate)
- - Stop function: no operation (main-oscillator and sub-oscillator are stopped)
- - Dual-clock slow operation mode: system is operated by the sub-oscillator (FOSC=Fs and Fm is stopped)
- Five types of interrupts
- - Four internal interrupts (Divider0, Divider1, Timer 0, Timer 1)
- - One external interrupts (RC Port)
- LCD driver output
- - 40 segments x 4 commons
- - 1/4 duty 1/3 bias driving mode
- - Clock source should be the sub-oscillator clock in the dual-clock operation mode
- MFP output pin
- - Output is software selectable as modulating or nonmodulating frequency
- - Works as frequency output specified by Timer 1
- DTMF output pin
- - Output is one channel Dual Tone Multi-Frequency signal for dialling
- Two built-in 14-bit frequency dividers
- - Divider0: the clock source is the output of the main-oscillator
- - Divider1: the clock source is the output of the sub-oscillator (dual-clock mode) or the Fosc/128 (single-clock mode)
- Two built-in 8-bit programmable countdown timers
- - Timer 0: one of two internal clock frequencies (FOSC/4 or FOSC/1024) can be selected
- - Timer 1: with auto-reload function and one of three internal clock frequencies (FOSC, FOSC/64 or Fs) can be selected by MR1 register; and the specified frequency can be delivered to MFP pin
- Built-in 18/15-bit watchdog timer selectable for system reset; enable the watch dog timer or not is determined by code option
- Powerful instruction set: 142 instructions
- 16-levels subroutine (include interrupt) nesting
Application Scenarios
The W742E81A/W742C81A microcontroller with LCD driver is ideal for applications that require a low-power, high-performance solution. It can be used in a wide range of electronic devices such as consumer electronics, industrial controls, and automotive systems. With its versatile I/O ports and interrupt capabilities, it can handle various input and output tasks efficiently. The LCD driver feature makes it suitable for applications that require display functionality, such as handheld devices and control panels.
Comparison
Advantages- High-performance 4-bit microcontroller with LCD driver
- Low power consumption with two power reduction modes
- Versatile I/O ports and interrupt capabilities
- Suitable for applications that require display functionality
Disadvantages- Limited to 4-bit ALU
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Datasheet
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- Datasheet: Download W742E81A
- Chipdatas Part: CD91-W742E81A
- Warehouse: China, Hong Kong
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- Last Updated: 2024/06/14 00:37 +0800
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