WT5081
8-bit
C with 4Mb ROM, 6.448Kbytes SRAM,
Push-Pull DAC and 48x32/64x32 LCD Driver
v1.11
Weltrend Semiconductor Inc.
24 2 2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
1 Rev. 0302089
eltrend
DESCRIPTION
The WT5081 is a high-performance, low-cost, CMOS 8-bit single-chip microcontroller with
48x32/64x32 dot-matrix LCD driver, which is suitable for variable applications, especially when
large number of LCD dots and large ROM space are needed, including edutainment toys, speech
synthesizer, Chinese character pagers, databank, handheld games and talking devices.
This chip has 8-bit CPU, RAM, I/Os, dual 16-bit timer/counters, interrupt controller, and a 9-bit
push-pull D/A output. To be suitable for portable battery-powered applications, a power saving
function is included. And, ESD protection circuitry is included to enhance the capability of ESD
resist.
FEATURES
u
8-bit single chip microcontroller with 48x32/64x32 LCD driver
u
6.448Kbytes SRAM and 512 Kbytes ROM
u
Voltage operating range from 2.9 V to 3.2 V
u
Built-in crystal OSC circuit and RC oscillator with maximum frequency up to 3.0 MHz
u
5 interrupt sources (external:1; internal:4) ; all sources have independent latches each and
multiple interrupt control is available
u
I/O port (20 pins)
I/O port 4 pins
I/O port 16 pins
u
Watchdog Timer
u
Operating current 1
mA/2MHz@3V; providing standby mode and key wake-up mode
u
RC OSC OFF and 32.768KHz X'tal OSC ON: current consumption < 15
uA @3V
u
Dual 16-bit timer/counters
u
9-bit push-pull D/A converter
u
ESD protection circuitry
u
Package: Chip form or 128-pin LQFP (14mm x 14mm x 1.4mm)
WT5081
8-bit
C with 4Mb ROM, 6.448Kbytes SRAM,
Push-Pull DAC and 48x32/64x32 LCD Driver
v1.11
Weltrend Semiconductor Inc.
24 2 2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
4 Rev. 0302089
eltrend
PIN FUNCTION (128-pin LQFP)
PIN NAME
PIN#
In/Out
FUNCTIONS
P20~ P23
113~ 110
I/O
4-bit I/O port
NC
104
-
Not connected
NC
105
-
Not connected
NC
106
-
Not connected
P10/SEG56~
P17/SEG63
125~
118
I/O
8-bit I/O port with latch
P00/SEG48~
P04/SEG52
P05/SEG53~
P07/SEG55
5~
1
128~
126
I/O
8-bit I/O port with latch
XTLIN
115
Input
Crystal input
XTLOUT
116
Output
Crystal output
RIN
114
Input
ROSC input; connected to VDD through
a resistor
NRESET
108
Input
System reset signal input; low active
NTEST
109
Input
Test pin. "H": Normal; "L": Test
SPKA
100
Output
Current D/A output
SPKB
102
Output
Current D/A output
VDD
52,98,101
Input
Power source
GND
13,99,103,117
Input
Ground
EXTINT
107
Input
External interrupt input
SEG0~SEG2
SEG3~SEG40
SEG41~SEG47
55~53
51~14
12~6
Output
LCD segment output
COM0~COM31
92~61
Output
LCD common output
V
LCD
58
Input
LCD voltage supply
BIAS1
60
Output
LCD bias voltage output
BIAS2
57
Output
LCD bias voltage output
BIAS3
56
Output
LCD bias voltage output
BIAS4
59
Output
LCD bias voltage output
Ca
97
Output
LCD pumping capacitor
Cb
95
Output
LCD pumping capacitor
Cc
96
Output
LCD pumping capacitor
Cd
94
Output
LCD pumping capacitor
WT5081
8-bit
C with 4Mb ROM, 6.448Kbytes SRAM,
Push-Pull DAC and 48x32/64x32 LCD Driver
v1.11
Weltrend Semiconductor Inc.
24 2 2F, No. 24, Industry East 9
th
Road,
Science-Based Industrial Park,
Hsin-chu, TAIWAN
7 Rev. 0302089
eltrend
Output High I
(I/O: P1&P0)
Iol
230
u A VDD=3.0V, Vpp=3V
Vol=0.3V
Output High I
(I/O: P1&P0)
Ioh
230
u A VDD=3.0V, Vpp=7V
Voh=2.7V
Output High I
(I/O: P1&P0)
Iol
230
u A VDD=3.0V, Vpp=9V
Vol=0.3V
Output High I
(I/O: P20~P23)
Ioh
0.9
m A VDD=3.0V
Voh=2.7V
Output Sink I
*(
2)
(I/O: P20~P23)
Iol
0.7
mA VDD=3.0V
Vol=0.3V
ROSC Resistor
RIN
1.6M
F
OSC
=1.5MHz @3.0V
CPU Clock
F
CPU
0.03
3.0
MHz F
CPU
=F
OSC
@3.0V
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