Zilog EZ80F91 - Manual (Page 30)

eZ80F91 Development Kit
User Manual
UM014220-0508 eZ80 Development Kit
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Bits 6 and 7 in Table 15 are the control bits for the user triggers. If either
bit is a 1, the corresponding Trig1 and Trig2 signals are driven High. If
either bit is 0, the corresponding Trig1 and Trig2 signals are driven Low.
Embedded Modem Socket Interface
The eZ80Acclaim! Development Kit features a socket for an optional 56
K modem (a modem is not included in the kit).
Connectors J1, J5, and J9 provide connection capability. The modem
socket interface provided by these three connectors is shown in
Figure 9 .
Table 11 through Table 13 identify the pins for each connector. The
embedded modem utilizes UART1, which is available via the Port C pins.
Figure 8. Trigger Pins J21 and J22
J21
Trig2
J22
Trig1
Ground
Trigger output