Specifications

RMU800A SERVICE MANUAL
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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. Name I/O Function
1 Vout O Reset.
2 GND GND.
3 Vin I Supply voltage.
3. Display CPU: UPD780112(Display Unit IC503)
3-1.Pin Function
Pin No. Name I/O Function
1 AVref +5V.
2 AVss GND.
3 IC(vpp) Internal connected.
4 VDD +5V.
5 Vss GND.
6 X1
7 X2
Connection to crystal.
8 RESET I CPU reset.
9 XT1 +5V.
10 XT2 Not used.
11 SHIFT Beat Shift.
12 Mute MIC Mute.
13 RSW3 Not used.
14 RSW2 Not used.
15 RSW0(DN) I Rotary SW0 (down).
16 RSW1(UP) I Rotary SW1 (up).
17 LCDBL O LCD backlight.
18 LCDCS O LCD control signal output.
19 LCDSOD O LCD data read.
20 LCDDAT O LCD data write.
21 LCDCLK O Clock output for LCD driver.
22 EVss GND.
23 EVdd +5V.
24 MICDAT O Serial data output for keypad MIC.
25 OUT1 Not used.
26 RXD1 I Serial data input.
27 TXD1 O Serial data output.