Zilog EZ80F91 Manual de usuario descargar pdf (Pagina 32)

eZ80F91 Development Kit

User Manual

UM014220-0508 eZ80 Development Kit

Components P4, T1, C3, C4, and U11 provide the phone line interface to

the modem. On the eZ80Acclaim!

Development Kit, LEDs D1, D2, D3,

and D4 function as status indicators for this optional modem.

The phone line connection for the modem is for the United States only.

Connecting the modem outside of the U.S. requires modification.

7 D2 RxD indicator; can drive an LED anode without additional circuitry

8 D3 DTR indicator; can drive an LED anode without additional circuitry

9 D4 TxD indicator; can drive an LED anode without additional circuitry

Table 13. Connector J1

Pin Symbol Description

2 MOD_DIS Modem disable, active Low

+5 VDC or +3.3 VDC input

24 GND Ground

25 PC4_DTR1 DTR interface; TTL levels

26 PC6_DCD1 DCD interface; TTL levels

27 PC3_CTS1 CTS interface; TTL levels

28 PC5_DSR1 DSR interface; TTL levels

29 PC7_RI1 Ring Indicator interface; TTL levels

30 PC0_TXD1 TxD interface; TTL levels

31 PC1_RXD1 RxD interface; TTL levels

32 PC2_RTS1 RTS interface; TTL levels

Table 12. Connector J9 (Continued)

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 77 78

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Zilog EZ80F91 Manual de usuario Pagina 32