Epson TM-U200 series Technical Manual page 56

C o n fid e n tia l
CPU pin functions
Pin CPU
No. Function
56 P90
57 P91
58 P92
59 P93
60 RD
61 WR
62 P32
63 P33
64 P40
65 P41
66 P42
67 P43
68 P44
69 P45
70 P46
71 P47
72 P48
73 P51/T04
74 P52
75 VCC
76 P53
77 P54
78 VSS
79 P55
80 P56
ROM (512K bit)
The printer control program and the character generator data are written in ROM (U8). The
control program controls the basic operations of the printer. All CPU (U5) operations follow this
program.
2-20 Mechanism Configuration and Operating Principles
Signal Name I/O
PF A/DSW5
PF B/DSW6
I/O
PF C/DSW7
PF D/DSW8
RD O
WR O
DKD1 O
DKD2 O
HEAD8 O
HEAD7 O
HEAD6 O
HEAD5 O
HEAD4 O
HEAD3 O
HEAD2 O
HEAD1 O
HEAD9 O
+24VCOM SW O
CRCOM SW O
VCC I
PFCOM SW O
CLK REQ O
VSS I
RTS O
PLED/DSW0 I/O
Level Description
Paper feed motor driver control 2-2 phase
excitation. All terminals on (LOW): hold.
TTL
DIP SW 1-5 to 1-8 read when P100, P101 are
LOW.
TTL External memory data read signal.
TTL External memory data write signal.
TTL Drawer kick-out driver signal 1. LOW: active.
TTL Drawer kick-out driver signal 2. LOW: active.
TTL Print head #8 driver signal. LOW: on.
TTL Print head #7 driver signal. LOW: on.
TTL Print head #6 driver signal. LOW: on.
TTL Print head #5 driver signal. LOW: on.
TTL Print head #4 driver signal. LOW: on.
TTL Print head #3 driver signal. LOW: on.
TTL Print head #2 driver signal. LOW: on.
TTL Print head #1 driver signal. LOW: on.
TTL Print head #9 driver signal. LOW: on.
Head, auto cutter, drawer kick-out power
TTL
switch. LOW: drive.
Carriage motor power switch. LOW: motor
TTL
drive.
(+5 V) Main power terminal (+5 V).
Paper feed motor power switch LOW: motor
TTL
drive.
TTL HOST interface CLK REQ.
(0 V) GND terminal.
TTL Host interface RTS. LOW: on.
PAPER OUT LED. Low: on.
TTL
DIP SW 2-2 read when P100 is LOW.
Rev. A