Cpu (Upd78052Gc-159-3B9) - Casio PCR-365A Service Manual

5-2. CPU (uPD78052GC-159-3B9)

Pin No. Signal
1 FB3 Not used
2 FB4 RAM bank 3
3 FB5 RAM bank 4
4 AVSS GND
5 PGM Not used
6 RAM Chip select signal for RAM
7 AVREF VDD
8 RXD Receive data
9 TXD Send data
10 WD Winder motor drive signal
11 DI Data signal from uPD16312
12 DO Data signal to uPD16312
13 CLK Clock signal for uPD16312
14 STB Data strobe signal for uPD16312
15 KC0 Key common signal (KC0)
16 KC1 Key common signal (KC1)
17 KC2 Key common signal (KC2)
18 KC3 Key common signal (KC3)
19 AD0 Address / Data signal (AD0)
20 AD1 Address / Data signal (AD1)
21 AD2 Address / Data signal (AD2)
22 AD3 Address / Data signal (AD3)
23 AD4 Address / Data signal (AD4)
24 AD5 Address / Data signal (AD5)
25 AD6 Address / Data signal (AD6)
26 AD7 Address / Data signal (AD7)
27 A8 Address signal (A8)
28 A9 Address signal (A9)
29 A10 Address signal (A10)
30 A11 Address signal (A11)
31 A12 Address signal (A12)
32 A13 Address signal (A13)
33 VSS GND
34 A14 Address signal (A14)
35 A15 Address signal (A15)
36 INIT PAD2 status
37 VPP PAD1 status
38 DSR Data set ready signal
39 KC4 Key common signal (KC4)
40 RD Output enable signal of RAM/ROM (RD)
41 WR Write enable signal of RAM (WR)
42 RA14 Address signal of ROM (Bank 0)
43 ASTB Latch enable for Address decoder (ASTB)
44 KI12 Key input signal (KI12)
45 KI13 Key input signal (KI13)
46 RA16 Address signal of ROM (Bank2)
47 RA15 Address signal of ROM (Bank 1)
48 MD Motor drive signal of printer (MD)
49 DRW Drawer drive signal (DRW)
50 BUZ Buzzer signal (BUZZ)
51 FD Paper feed signal of printer (FD)
52 HD.A Head drive signal of printer (HD.A)
53 HD.B Head drive signal of printer (HD.B)
54 HD.C Head drive signal of printer (HD.C)
55 HD.D Head drive signal of printer (HD.D)
Description
— 8 —
Status of Status of
In/Out
Power On Power OFF
— —
Out High
Out High
— GND
— —
Out High
— 5 V
In High
Out High
Out Low
In Pulse
Out Pulse
Out Pulse
Out Pulse
Out Pulse
Out Pulse
Out Pulse
Out Pulse
In/Out Pulse
In/Out Pulse
In/Out Pulse
In/Out Pulse
In/Out Pulse
In/Out Pulse
In/Out Pulse
In/Out Pulse
Out Pulse
Out Pulse
Out Pulse
Out Pulse
Out Pulse
Out Pulse
— GND
Out Pulse
Out Pulse
— —
— —
In High
Out Pulse
Out Pulse
Out Pulse
Out High
Out Pulse
In High
In High
Out High
Out High
Out Low
Out Low
Out Low
Out Low
Out Low
Out Low
Out Low
Out Low
—
High
High
GND
—
Low
5 V
High
High
Low
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
GND
High
High
—
—
High
High
High
High
High
Low
High
High
High
High
Low
Low
Low
Low
Low
Low
Low
Low