Zilog eZ80F92 - Manual (Page 32)

eZ80F92 Development Kit
User Manual
eZ80Acclaim!
®
Development Platform UM013911-0607
28
An LED display sample program is shipped with the eZ80F92 Develop-
ment Kit. Please refer to the eZ80Acclaim!™ Development Kits Quick
Start Guide (QS0020) or to the Tutorial section in the ZiLOG Developer
Studio—eZ80Acclaim!™ User Manual (UM0144).
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 9.
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. The user 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 general-purpose trigger output pins are provided on the
eZ80Acclaim!
® Development Platform. Labeled J21 (Trig2) and J22
(Trig1), these pins allow the user a way to trigger external equipment to
aid in the debug of the system. See Figure 8 for trigger pin details.
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.
Figure 8. Trigger Pins J21 and J22
J21
Trig2
J22
Trig1
Ground
Trigger output