STK88C4831

Syntek Semiconductor Co., Ltd. 1. FEATURES : STK88C4831 w w w .D at aS he et 4U .c om Voice Microcontroller 1 / 7 Ver 3.0 06/99 www.DataSheet4U.com * Operating voltage : 2.5V - 3.5V. * Maximum CPU operating frequency : 4MHz at 2.7V * Built-in RC oscillator circuit. The oscillation frequency is controlled by an external resistor. * Built-in PLL circuit to generate the system clock with 5 times oscillation frequency. * Audio output ports with 3-bit loudness control One current output port for speaker output. Two PWM output ports can drive 8,16,64 ohm speaker or buzzer directly. * I/O port. 8 I/O pins. Port 1 with selectable interrupt. Port 1 with 6 CDS interface and 2 schmitt trigger input. * Output port 8 output pins. port 2 with 8 inverter type output pins. * Built in 128 bytes RAM *Built in ROM for program and speech data 48K bytes for 88C4831 37K bytes for 88C3731 * Three 8-bit timers. * Five interrupt sources : NMI - Watchdog Timer interrupt IRQ1 - Timer 1 interrupt IRQ2 - Timer 2 interrupt IRQ3 - Timer 3 interrupt IRQ4 - External interrupt Syntek Semiconductor Co., Ltd. STK88C4831 2. PIN DESCRIPTION : Pin name P10-P17 P20-P27 AUD1 PWM1 PWM2 OSC RESB CAP TESTB VDD VSS I/O I/O O O O O I I I I (Total 25 pads) Function description 8-bit I/O pins for port 1 with wake-up interrupt 8-bit output pins for port 2 Audio channel 1 current mode D/A output Audio channel 1 PWM output Audio channel 2 PWM output Main system oscillator input pin for chip System reset Capacitor fo...