Circuit Description - Kenwood 1050MD Service Manual

1050MD/DM-5090/DM-9090
2-2 Pin description (uPD784035GC)
No. Name
1 SCLK
2 N.C.
3 XMODE
4~6 N.C.
7 RESET
8 Vdd
9,10 X2,1
11 Vss
12~20 N.C.
21 CS
22 WR
23 RD
24~27 N.C.
28 A15
29~35 A14~A8
36~43 D7~D0
44 STB
45,46 GND
47,48 N.C.
49 CENA
50 CTXD
51 CRXD
52~55 N.C.
56 Vdd
57~61 N.C.
62 CTR
63 TXT
64 Avdd
65 AVref1
66 AVss
67,68 N.C.
69 AVref2
70 AVref3
71,72 N.C.
73 DQSY
74~77 N.C.
78 SRDT
79 RXD
80 TXD
8

CIRCUIT DESCRIPTION

I/O
O Text data read clock
O No used
O Text data decoder reset
O No used
I Reset signal input
- Microprocessor power supply
- 12.5MHz oscillator
- GND
O No used
O Chip select for SRAM control
O Write strobe for SRAM control
O Read strobe for SRAM control
O No used
O No used
- SRAM control terminal (address BUS), A14~A8
- SRAM control terminal (address / data BUS) , D7~D0
O Address strobe signal output
- GND
O No used
O Communication to main u-COM (enable)
I Communication to main u-COM (uart TXD)
O Communication to main u-COM (uart RXD)
O No used
- Microprocessor power supply
I GND
I Cyber titler
I CD text
- A/D power supply terminal (+5V)
- A/D reference voltage
- A/D GND
O No used
- D/A reference voltage
- D/A GND
I Noused
I Text data reading permitted terminal
I No used
I Text data reading line
I Communication to cyber titler (UART)
O Communication to cyber titler (UART)
Description
L: Power Down
H: Power Down
(J type only)
(J type only)
L: Interrupt
(J type only)
(J type only)