Rev. A
Mechanism Configuration and Operating Principles 2-19
TM-U200 Series (Type A/AM)Technical Manual
C o n fid e n tia l
The reset signals differ, depending on the interface specifications:
RS-232 serial interface:Two signals can be selected (DSR signal or pin 25 input signal).
IEEE 1284 parallel interface: Pin 25 must be used for the RESET signal. DIP switch 2-8 is fixed
to ON. The printer can be reset with the Init signal (pin 31) from
the host.
Figure 2-21 Reset circuit
Pin 29 of CN4 is the reset signal of the IEEE 1284 parallel interface circuit board.
CPU
The printer uses an external 8-bit and internal 16-bit CPU, with an external clock of 14.7 MHz.
The CPU (U5) controls the internal processing of the printer according to the printer control
program written in EPROM (U8) or Flash memory (U101).
CPU pin functions
Pin
No.
CPU
Function
Signal Name
I/O
Level
Description
1
P57
ELED/DSW9
I/O
TTL
ERROR LED. LOW: on. DIP SW 2-1 is read when
P100, P101 are LOW.
2
NMI
NMI
I
TTL
Not used (connected to +5 V directly).
3
P100
AC1/DSEL
O
TTL
Auto cutter drive (1) and DIP SW read selection.
LOW: read (read once after initialization).
HIGH: break status when used as motor control
port.
4
P101
AC 2/DSEL
O
TTL
Auto cutter drive (2) and DIP SW read selection.
LOW: read (read once after initialization).
HIGH: break status when used as motor control
port. This pin must change at the same time as
P100.
5
AVCC
AVCC
I
(+5 V)
Analog/digital converter standard voltage.
DSR_RESET
#25_RESET
CN4
27
28
8
7
R50
R26
{
5 V
+
C28
C101
_
C26
DSW2
Q31
Q32
{
5 V
R49
6
4
7
5
IN OUT
C GND
U9
DM111
29
C42
#RST
C27
{
5 V
D26
R44
21
RESET
U5
Содержание TM-U200 Series
Страница 1: ...Confidential Technical manual TM U200 Series Type A AM English 400950100 Copied Date 199 Copied by ...
Страница 6: ...iv Confidential Revision Sheet Revision Page Altered Items and Contents Rev A ...
Страница 72: ...2 30 Mechanism Configuration and Operating Principles Rev A Confidential ...
Страница 172: ...6 Appendix Rev A Confidential Main Circuit Board Parts Layout ...
Страница 176: ...10 Appendix Rev A Confidential ...
Страница 186: ...Rev A Appendix A 20 TM U200 Series Type A AM Technical Manual Confidential ...
Страница 187: ...Confidential SEIKO EPSON CORPORATION Printed in Japan ...