Voice Microcontroller 1 / 7 Ver 3.0 06/99
Syntek Semiconductor Co., Ltd.
STK88C4831
1. FEATURES :
* 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
Voice Microcontroller 2 / 7 Ver 3.0 06/99
Syntek Semiconductor Co., Ltd.
STK88C4831
2. PIN DESCRIPTION :
(Total 25 pads)
Pin name
I/O
Function description
P10-P17
I/O
8-bit I/O pins for port 1 with wake-up interrupt
P20-P27
O
8-bit output pins for port 2
AUD1
O
Audio channel 1 current mode D/A output
PWM1
O
Audio channel 1 PWM output
PWM2
O
Audio channel 2 PWM output
OSC
I
Main system oscillator input pin for chip
RESB
I
System reset
CAP
I
Capacitor for PLL circuit.
TESTB
I
Test pin. Keep floating or connect to Vdd
VDD
Power input
VSS
Power ground
PART
Capacity
8-bit Algorithm 5-bit Algorithm
88C4831
48KB
C000h*8 49150*8 13330h*5 78640*5
88C3731
37KB
9000h*8 36860*8 E660h*5 58980*5
Voice Microcontroller 3 / 7 Ver 3.0 06/99
Syntek Semiconductor Co., Ltd.
STK88C4831
3. Block diagram :
8-bit CPU
48K bytes ROM
128 bytes RAM
OSC
&
Clock Gen.
3 Timers
PWM output
8-bit D/A with
3-bit volume
control
I/O port 1
Out port 2
PWM1
PWM2
AUD1
P10-P17
P20-P27
OSC
CAP
Voice Microcontroller 4 / 7 Ver 3.0 06/99
Syntek Semiconductor Co., Ltd.
STK88C4831
4.Data/Control Register Line up
1)
Sleep mode register. Write only.
2)
IRQ flag register. Read & Write.
3)
Port 0 data. Read & write.
4)
Port 0 control . Write only.
5)
Port 1 data. Write only.
6)
Port 0 interrupt control. Write only.
7)
Port 1 pull-up control. Write only.
8)
Timer 1,2,3 data. Write only.
9)
Overall control. Write only.
10)
Loudness control. Write only
11)
Data for audio. Write only.
12)
Watchdog timer clear. Write only.
Voice Microcontroller 5 / 7 Ver 3.0 06/99
Syntek Semiconductor Co., Ltd.
STK88C4831
5. ABSOLUTE MAXIMUM RATINGS
Operating temperature ........................................................................ 0 to 70
Storage temperature ...................................................................... -65 to 150
Supply voltage ............................................................................................... 7 V
Input voltage ........................................................................... -0.6 to Vdd+0.6 V
6. ELECTRICAL CHARACTERISTIC :
Parameter
Symbol
Condition
Min Typ. Max Unit
Supply Voltage
Vdd
2.5
3.0
3.5
V
Rosc
Rosc
650
ohm
RC oscillation frequency
sys
Vdd=2.7V
400
800
Khz
Operating current
Idd
Vdd=3V,
sys=4Mhz
1.5
mA
Standby current
Istdby Vdd=3V,
sys=4Mhz
1
mA
Sleep mode current
Islp
Vdd=3V
1
A
Input high voltage
Vih
Vdd=3.0V
2.0
V
Input low voltage
Vil
Vdd=3.0V
-0.6
0.8
V
Input high leakage current
Iih
Vih=Vdd
1
A
Input low leakage current
Iil
Vil=0
-5
A
Output high voltage
Voh
Ioh=-2mA
Vdd-
0.4
Vdd
V
Output low voltage
Vol
Iol=4mA
0
0.4
V
Output high voltage
(PWM1, PWM2)
Voh
Vdd=3V, Ioh=-60mA
Vdd-1
Vdd
V
Output low voltage
(PWM1, PWM2)
Vol
Vdd=3V, Iol=75mA
0
1
V
AUD (D/A full scale)
Io
Vdd=3V, Rl=100 OHM
-4.0
mA
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