Semiconductor Data - HYT TM-800 Service Manual

Semiconductor Data

1. Voltage Supply: TA7805F (Display Unit IC501): Providing supply voltage.
2. Voltage Detector: R3111H421C(Display Unit IC502)
2-1.Pin Function
Pin No.
1
2
3
3. Display CPU: UPD780112(Display Unit IC503)
3-1.Pin Function
Pin No. Name
1 AVref
2 AVss
3 IC(vpp)
4 VDD
5 Vss
6 X1
7 X2
8 RESET
9 XT1
10 XT2
11 SHIFT
12 Mute
13 RSW3
14 RSW2
15 RSW0(DN)
16 RSW1(UP)
17 LCDBL
18 LCDCS
19 LCDSOD
20 LCDDAT
21 LCDCLK
22 EVss
23 EVdd
24 MICDAT
25 OUT1
26 RXD1
27 TXD1
Name I/O
Vout O
GND
Vin I
I/O
I
I
I
O
O
O
O
O
O
I
O
Function
Reset.
GND.
Supply voltage.
Function
+5V.
GND.
Internal connected.
+5V.
GND.
Connection to crystal.
CPU reset.
+5V.
Not used.
Beat Shift.
MIC Mute.
Not used.
Not used.
Rotary SW0 (down).
Rotary SW1 (up).
LCD backlight.
LCD control signal output.
LCD data read.
LCD data write.
Clock output for LCD driver.
GND.
+5V.
Serial data output for keypad MIC.
Not used.
Serial data input.
Serial data output.
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TM-800 SERVICE MANUAL