W742S819 Datasheet, PDF (2/11 Pages) Winbond – 4-BIT TELEPHONE CONTROLLER

W742S819
1. GENERAL DESCRIPTION
The W742S819 is a high-performance 4-bit micro-controller (μC) that provides an LCD driver and
three OpAmps. The device contains a 4-bit ALU, two 8-bit timers, two dividers (for two oscillators) in
dual-clock operation, a 24 × 8 LCD driver, six 4-bit I/O ports (including 1 output port for LED driving),
three OpAmps(Operational Amplifiers), and one channel DTMF generator. There are also five interrupt
sources and 16-levels subroutine nesting for call subroutine or interrupt applications. The W742S819
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.
2. FEATURES
y Operating voltage: 2.4V - 5.5V
y Dual-clock operation mode (Connect to 32768 Hz crystal only)
− Fslow oscillator : 32768Hz OSC
− Ffast oscillator : PLL ( Phase Lock Loop ) output enable
y Memory
− 12288 x 16 bits program ROM (including 48K x 4 bit look-up table)
− 1536 x 4 bits data RAM (including 16 nibbles x 16 pages working registers)
− 24 x 8 LCD data RAM
y 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 ports/4 pins(RF)
y Power-down mode
− Hold function: no operation (excluding Fslow and Fosc oscillator)
− Stop function: no operation (Fslow and Fosc oscillator are stopped)
− Dual-clock slow operation mode: system is operated by 32768Hz (FOSC=Fslow and Ffast
stopped)
y Five types of interrupts
− Four internal interrupts (Divider0, Divider1, Timer 0, Timer 1)
− One external interrupts (RC Port)
y LCD driver output
− 24 segments x 8 commons
− 1/8 duty, 1/3 bias driving mode by option code
− 16 level software LCD contrast adjusting
y MFP output pin
− Output is software selectable as modulating or non-modulating frequency
− Works as frequency output specified by Timer 1
y DTMF output pin (PLL should be enable in this function)
− Output is one channel Dual Tone Multi-Frequency signal for dialing
y Three OpAmps(Operational Amplifiers)
− Three general purpose OpAmps with positive inputs, negative inputs and outputs.
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