Zilog EZ80F91 Instrukcja Użytkownika Pobierz pdf (Strona 29)

eZ80F91 Development Kit

User Manual

UM014220-0508 eZ80 Development Kit

Modem Reset

The Modem Reset signal, MRESET, is used to reset an optional socket

modem. This signal is controlled by bit 5 in the register shown in

Table 15.

The MRESET signal is available at the embedded modem socket inter-

face (J9, Pin 1).

Setting this bit Low places the optional socket modem into

a reset state. You must pull this bit High again to enable the socket modem.

Reference the appropriate documentation for the socket modem to reset

timing requirements.

User Triggers

Two trigger output pins are provided on the eZ80Acclaim!

Development

Kit. Labeled J21 (Trig2) and J22 (Trig1), these pins allow you to trigger

external equipment to aid in the debug of the system. See Figure 8 for

trigger pin details.

Table 10. GPIO Data Register

Function/Bit # 76543210

GPIO D0 X

GPIO D1 X

GPIO D2 X

GPIO D3 X

GPIO D4 X

GPIO D5 X

GPIO D6 X

GPIO D7 X

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 77 78

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