Epson TM-T88II Series Manual de Instruções Página 58

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Rev. A Mechanisms and Operation 2-19
TM-T88 Series Technical Manual
Power Supply Circuits
Filter circuit
+24V output circuit
+5V output circuit
CPU and CPU Peripheral Logic Circuits
CPU
The CPU (U4) of this printer has an 8-bit external data bus, a 16-bit internal data bus, and a
19.66MHz external clock. The CPU (U4) controls the printer in accordance with the printer
control program written in flash ROM (U6). The following table shows the function of each CPU
pin.
CPU signal assignments and functions
No. Pin name Signal name Function I/O Level
1 P65 Not used. Open O TTL
2 P70 Not used. Open O TTL
3 P71 Not used. Open O TTL
4 P72 Not used. Open O TTL
5 P73 Not used. Open O TTL
6 P74 RPF_+A Receipt side O TTL
7 P75 RPF_+B Paper feed motor drive control: 2-2 phase drive O TTL
8 P76 RPF_-A OR 1-2 phase drive O TTL
9 P77 RPF_-B All terminals ON (L): hold O TTL
10 NMI
NMI Not used. +5V direct connection I TTL
11 P80/TXD0 TXD HOST I/F SD L:ON O TTL
12 P81/RXDO RXD HOST I/F RD L:ON I TTL
13 P82/
SCLKO
CLK IN/DTR HOST I/F CLK IN/DTR O TTL
14 P83 CLK REQ HOST I/F CLK REQ O/I TTL
15 P84 CTS HOST I/F CTS L:ON O TTL
16 P85 DET HOST I/F DET I TTL
17 AGND AGND (A/D converter) GND terminal I (0V)
18 VREF VREF A/D converter reference voltage I (+5V)
19 VCC VCC Main power supply terminal (+5V) I (+5V)
20 P90/AN0 AN0OUT V DTC: +24V power supply voltage value detection I Analog
21 P90/AN1 AN1OUT RRE: Receipt paper detect signal I Analog
22 P90/AN2 AN2OUT THR: receipt head temperature detect signal
(thermal head)
I Analog
23 P90/AN3 Not used. Open I Analog
24 AM8/16
AM8/16 +5V direct connection I TTL
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