Table 10 – Zilog EZ80F91 User Manual
Page 29
eZ80F91 Development Kit
User Manual
UM014220-0508
eZ80 Development Kit
24
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
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
for
trigger pin details.
Table 10. GPIO Data Register
Function/Bit #
7
6
5
4
3
2
1
0
GPIO D0
X
GPIO D1
X
GPIO D2
X
GPIO D3
X
GPIO D4
X
GPIO D5
X
GPIO D6
X
GPIO D7
X