Cpu - Epson TM-U200 series Technical Manual

C o n fid e n tia l

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
1 P57
2 NMI
3 P100
4 P101
5 AVCC
6 AVSS
7 P60/AN0
8 P61/AN1
9 P62
10 P63
11 P64
12 P65
13 P66
14 P67
15 VCC
16 P70
17 P71
18 P72/RXD1
19 P73/CLK1
20 P74/TXD1
21 RESET
22 CLK
23 VSS
2-18 Mechanism Configuration and Operating Principles
Signal Name I/O
ELED/DSW9 I/O
NMI I
AC1/DSEL O
AC 2/DSEL O
AVCC I
AVSS I
V DTC I
HD TEMP I
NE I
DK S I
RE I
HP DTC I
DET I
AC RST I
VCC I
CTS I
CCE O
RD I
CLK IN/DTR I/O
SD O
RESET I
CLK O
VSS I
Level Description
ERROR LED. LOW: on. DIP SW 2-1 is read when
TTL
P100, P101 are LOW.
TTL Not used (connected to +5 V directly).
Auto cutter drive (1) and DIP SW read selection.
LOW: read (read once after initialization).
TTL
HIGH: break status when used as motor control
port.
Auto cutter drive (2) and DIP SW read selection.
LOW: read (read once after initialization).
TTL HIGH: break status when used as motor control
port. This pin must change at the same time as
P100.
(+5 V) Analog/digital converter standard voltage.
(0 V) Analog/digital converter GND terminal.
Analog +24 V power voltage detection.
Analog Head temperature detection.
Paper roll near-end detection.
TTL
LOW: no paper; HIGH: paper present.
TTL Drawer open/closed. LOW: open.
Paper roll end detection.
TTL
LOW: paper present; HIGH: no paper.
Carriage home position sensor.
TTL
LOW: home position.
TTL Host interface DET.
TTL Auto cutter position detection (reset).
(+5 V) Main power terminal.
TTL Host interface CTS. LOW: on.
TTL 4M ROM CE signal. LOW: active.
TTL Host interface RD. LOW: on.
TTL Host interface CLK IN/DTR.
TTL Host interface SD. LOW: on.
--- CPU reset input. LOW: on.
TTL Not used. Open.
(0 V) GND terminal.
Rev. A