Embedded Modem Socket Interface; Figure 8. Trigger Pins J21 And J22 - ZiLOG eZ80L92 User Manual

eZ80L92 Development Kit
User Manual
28

Embedded Modem Socket Interface

Operational Description

Figure 8. Trigger Pins J21 and J22

Bits 6 and 7 in Table 9 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.
®
The eZ80 Development Platform features a socket for an optional 56K
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.
Tables 10 through 12 identify the pins for each connector. The embedded
modem utilizes UART1, which is available via the Port C pins.
J21 J22
Ground
Trigger output
Trig2 Trig1
PRELIMINARY UM012906-0103