Epson TM U200D Technical Reference - Page 62

ROM 512K bit, RAM CPU internal 16K bit, Data received from the interface receive buffer

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TM-U200D/U200PD Technical Manual CPU pin functions Pin CPU No. Function Signal Name I/O 70 P46 HEAD2 O 71 P47 HEAD1 O 72 P48 HEAD9 O 73 P51/T04 +24VCOM SW O 74 P52 75 VCC CRCOM SW O VCC I 76 P53 PFCOM SW O 77 P54 78 VSS 79 P55 CLK REQ O VSS I RTS O 80 P56 PLED/DSW0 I/O Level TTL TTL TTL TTL TTL (+5V) TTL TTL (0V) TTL TTL Description Print head #2 drive signal Low: on Print head #1 drive signal Low: on Print head #9 drive signal Low: on Head, auto cutter, Drawer kick-out power switch Low: drive Motor, carriage power switch Low: motor drive Main power terminal (+5V) Motor, paper feed power switch Low: motor drive HOST interface CLK REQ GND terminal Host interface RTS Low: on PAPER OUT LED Low: on DIP SW 2-2 read when P100 is low 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. RAM (CPU internal 16K bit) RAM is used as temporary storage for the following: t Data received from the interface (receive buffer) t Pattern data to be printed by the print head (printer buffer) t Data used by the CPU (U5) during processing (flags, pointers, etc.). Rev. B Mechanism Configuration and Operating Principles

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Rev. B
Mechanism Configuration and Operating Principles
TM-U200D/U200PD Technical Manual
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.
RAM (CPU internal 16K bit)
RAM is used as temporary storage for the following:
Data received from the interface (receive buffer)
Pattern data to be printed by the print head (printer buffer)
Data used by the CPU (U5) during processing (flags, pointers, etc.).
70
P46
HEAD2
O
TTL
Print head #2 drive signal Low: on
71
P47
HEAD1
O
TTL
Print head #1 drive signal Low: on
72
P48
HEAD9
O
TTL
Print head #9 drive signal Low: on
73
P51/T04
+24VCOM SW
O
TTL
Head, auto cutter, Drawer kick-out power
switch Low: drive
74
P52
CRCOM SW
O
TTL
Motor, carriage power switch Low: motor drive
75
VCC
VCC
I
(+5V)
Main power terminal (+5V)
76
P53
PFCOM SW
O
TTL
Motor, paper feed power switch Low: motor
drive
77
P54
CLK REQ
O
TTL
HOST interface CLK REQ
78
VSS
VSS
I
(0V)
GND terminal
79
P55
RTS
O
TTL
Host interface RTS Low: on
80
P56
PLED/DSW0
I/O
TTL
PAPER OUT LED Low: on
DIP SW 2-2 read when P100 is low
CPU pin functions
Pin
No.
CPU
Function
Signal Name
I/O
Level
Description