Epson TM-U950 Technical Manual page 78

CONFIDENTIAL
Table 2-1. CPU Pin Assignments (continued)
Pin
number
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
ROM (512 KB, [1 M in printers with an MICR reader])
The ROM contains the printer control program and the character generator. The control
program governs the basic printer functions. The CPU operates entirely under the control of this
program.
RAM (64 KB)
The RAM is used for the following:
Rev. A
CPU function Signal designation
A4 A4
A3 A3
A2 A2
A1 A1
A0 A0
P87 TXD
P86 RXD
P85 DTR
P84 CTS1
P83 IMSD
P82 IMSD
P81 IMDTR_TM
P80 CTSO
(V ) -
cc
(AV ) -
cc
(V ) -
ref
(AV ) -
ss
(V ) -
ss
P77 CACT
P76 CACR
P75 CCRP
P74 CHP
AN3 CSOE
AN2 CSLPIN
AN1 CHDTH
As input buffer for data received via the connector interface.
TM-U950/U950P Technical Manual
I/O Level Description
O TTL Address signal Bit 4
O TTL Address signal Bit 3
O TTL Address signal Bit 2
O TTL Address signal Bit 1
O TTL Address signal Bit 0
O TTL TXD signal output for the interface circuit board
RXD signal input from the interface circuit
I TTL
board
O TTL DTR signal output for the interface circuit board
O TTL Unused (pulled down to (Vss))
SD signal output for the IM-403/405 serial
I TTL
interface (not used on the TM-U950P)
RD signal input from the IM-403/405 serial
I TTL
interface (not used on the TM-U950P)
DTR signal output for the IM-403/405 serial
O TTL
interface (not used on the TM-U950P)
O TTL Unused (pulled down to (Vss))
- +5V Power supply
- +5V Analog power supply
- +5V Analog reference voltage
- GND Analog power supply
- GND Power supply
I TTL Auto-cutter full/partial signal
I TTL Auto-cutter reset signal
I TTL Carriage detachment sensor signal
I TTL Home position sensor signal
I Analog Slip paper eject sensor signal
I Analog Slip paper insert sensor signal
I Analog Print head temperature sensor signal
Mechanism Configuration and Operating Principles 2-33