Samsung SRP-350PG - SRP 350 B/W Direct Thermal Printer Service Manual page 47

6 Reference Information
6-1 Semiconductor Base Diagram
Pin Port
1 P9.6 DIP_C3
2 P9.5 DIP_C2
3 P9.4 DIP_C1
4 P9.3 DIP_R3
5 P9.2 DIP_R2
6 P9.1 DIP_R1
7 P9.0 DIP_R4
8 BYTE +5V (VCC)
9 CNVSS +5V (VCC)
10 P8.7 Parallel Paper Error
11 P8.6 StepI1
12 RESET Reset
13 XOUT N.C
14 VSS Ground
15 XIN X-TAL(16.00MHz)
16 VCC +5V (VCC)
17 P8.5 NMI Pull-Up (VCC)
18 P8.4 Parallel /Init
19 P8.3 Parallel /SelectIn
20 P8.2 Parallel / USB Interrupt
21 P8.1 Step_B
22 P8.0 Step_A
23 P7.7 Parallel Write
24 P7.6 Buzzer
25 P7.5 Parallel Read
26 P7.4 N.C
27 P7.3 TPH Strobe#2
28 P7.2 TPH Strobe#1
29 P7.1 StepI0
30 P7.0 I/F Board Select
31 P6.7 TPH Data
32 P6.6 TPH Latch
33 P6.5 TPH Clock
34 P6.4 DSR(RS-232), CTS(RS-485)
35 P6.3 ACK(Parallel), TXD(RS-232,RS-485)
36 P6.2 SLCT(Parallel), RXD(RS-232,RS-485)
37 P6.1 Thermal Head Voltage On/Off
38 P6.0 DTR(RS-232), RTS(RS-485)
39 P5.7 /RDY
40 P5.6 Pull-Up (ALE)
41 P5.5 Pull-Up (/HOLD)
42 P5.4 Pull-Up (/HLDA)
43 P5.3 N.C (BCLK)
44 P5.2 /RD
45 P5.1 N.C (/BHE)
46 P5.0 /WR
47 P4.7 /CS3 (Chip Select 3) – USB CS
48 P4.6 /CS2 (Chip Select 2)
49 P4.5 /CS1 (Chip Select 1)
50 P4.4 /CS0 (Chip Select 0)
6-2
Function I/O Pin Port
In 51 P4.3
In 52 P4.2
In 53 P4.1
Out 54 P4.0
Out 55 P3.7
Out 56 P3.6
Out 57 P3.5
- 58 P3.4
- 59 P3.3
Out 60 P3.2
Out 61 P3.1
In 62 VCC
- 63 P3.0
- 64 VSS
In 65 P2.7
- 66 P2.6
- 67 P2.5
Out 68 P2.4
In 69 P2.3
In 70 P2.2
Out 71 P2.1
Out 72 P2.0
Out 73 P1.7
Out 74 P1.6
Out 75 P1.5
- 76 P1.4
Out 77 P1.3
Out 78 P1.2
Out 79 P1.1
Out 80 P1.0
Out 81 P0.7
Out 82 P0.6
Out 83 P0.5
In 84 P0.4
Out 85 P0.3
In 86 P0.2
Out 87 P0.1
Out 88 P0.0
Out 89 P10.7
- 90 P10.6
- 91 P10.5
- 92 P10.4
- 93 P10.3
Out 94 P10.2
- 95 P10.1
Out 96 AVSS
Out 97 P10.0
Out 98 VREF
Out 99 AVCC
Out 100 P9.7
Function
Address 19
Address 18
Address 17
Address 16
Address 15
Address 14
Address 13
Address 12
Address 11
Address 10
Address 9
+5V / VCC
Address 8
Ground
Address 7
Address 6
Address 5
Address 4
Address 3
Address 2
Address 1
Address 0
Drawer#2
Drawer#1
Paper LED
Error LED
Parallel Auto Feed
Parallel /Fault
Auto Cutter B
Auto Cutter A
Data 7
Data 6
Data 5
Data 4
Data 3
Data 2
Data 1
Data 0
Thermal Temperature ADC Voltage
Parallel Busy
Auto Cutter Sensing S/W
Cover Sensing S/W
Near End Sensing S/W
Paper Feed S/W
Paper End Sensing S/W
Ground
Drawer Compulsory Sensing S/W
AD Reference Voltage Input
+5V (VCC)
DIP_C4
Samsung Electro-Mechanics
I/O
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
-
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
In
Out
Out
Out
In/Out
In/Out
In/Out
In/Out
In/Out
In/Out
In/Out
In/Out
In
In
In
In
In
In
In
-
In
In
-
In