Zilog EZ80190 - Manual (Page 31)

eZ80190 Development Kit
User Manual
UM014108-0810 Operational Description
27
An LED display sample program is shipped with the eZ80190 Develop-
ment Kit. Please refer to the eZ80190 Development Kit Quick Start Guide
(QS0004) or to the Tutorial section in the ZiLOG Developer Studio II—
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. More information about this signal is provided
in the next section.
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.
Cathode Row 1 X
MRESET X
Trig 1 X
Trig 2 X
Table 9. Bit Access to the LED Cathode, Modem, and Triggers (Continued)
Function
Bit #
7 6 5 4 3 2 1 0