Epson TM U200D Technical Reference - Page 59

CPU, program written in EPROM U8.

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RS-232 serial interface: IEEE 1284 parallel interface: Two signals can be selected (DSR signal or pin 25 input signal). Pin 25 RESET signal must be used. DIP switch 2-4 is fixed to ON. The printer can be reset with the nInit signal (pin 31) from the host. CN4 #RST 29 DSR_RESET 28 #25_RESET 27 DSW2 D16 3 4 D1 {5 V {5 V Q31 C42 R50 + _ C28 R49 U9 1 IN 4 C 5 OUT 3 GND C26 Q32 {5 V U5 D26 21 RESET C27 Figure 2-19 Reset circuit CN4 pin 29 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). CPU pin functions Pin CPU No. Function Signal Name I/O 1 P57 ELED/DSW9 I/O 2 NMI NMI I 3 P100 AC1/DSEL O 4 P101 AC 2/DSEL O 5 AVCC AVCC I 6 AVSS AVSS I 7 P60/AN0 V DTC I 8 P61/AN1 HD TEMP I Level Description TTL TTL TTL TTL (+5V) (0V) Analog Analog ERROR LED Low: on DIP SW 2-1 read when P100, P101 is low Not used (Connected to +5V directly) Auto cutter drive (1) and DIP SW read selection Low: read (read once after the initialization) High: break status when used as motor control port Auto cutter drive (2) and DIP SW read selection Low: read (read once after the initialization) High: break status when used as motor control port This pin must be changed at the same time as P100. Analog/digital convertor standard voltage (Analog/digital convertor) GND terminal +24V power voltage detection Head temperature detection 2-18 Mechanism Configuration and Operating Principles Rev.B

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2-18
Mechanism Configuration and Operating Principles
Rev.B
RS-232 serial interface:
Two signals can be selected (DSR signal or pin 25 input signal).
IEEE 1284 parallel interface:
Pin 25 RESET signal must be used. DIP switch 2-4 is fixed to ON.
The printer can be reset with the nInit signal (pin 31) from the
host.
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).
Figure 2-19
Reset circuit
CN4 pin 29 is the reset signal of the IEEE 1284 parallel interface circuit board.
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 read when P100, P101 is low
2
NMI
NMI
I
TTL
Not used (Connected to +5V directly)
3
P100
AC1/DSEL
O
TTL
Auto cutter drive (1) and DIP SW read selection
Low: read (read once after the 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 the initialization)
High: break status when used as motor control
port
This pin must be changed at the same time as
P100.
5
AVCC
AVCC
I
(+5V)
Analog/digital convertor standard voltage
6
AVSS
AVSS
I
(0V)
(Analog/digital convertor) GND terminal
7
P60/AN0
V DTC
I
Analog
+24V power voltage detection
8
P61/AN1
HD TEMP
I
Analog
Head temperature detection
DSR_RESET
#25_RESET
CN4
27
28
4
3
R50
{
5 V
+
C28
_
C26
DSW2
Q31
Q32
{
5 V
R49
5
3
1
4
IN
OUT
C
GND
U9
D16
D1
29
C42
#RST
C27
{
5 V
D26
21
RESET
U5