Zilog EZ80F91 - Manual (Page 25)

eZ80F91 Development Kit
User Manual
UM014220-0508 eZ80 Development Kit
20
Thermostat Application Module (not provided in the kit) is an example of
an application-specific module that demonstrates an HVAC control sys-
tem. Implementing an application module with the Application Module
Interface requires that the eZ80F91 Module also be mounted on the
eZ80Acclaim! Development Kit, because the eZ80F91 device controls the
application. To mount an application module, use the two male headers J6
and J8.
Connector J6 carries the General-Purpose Input/Output ports (GPIO), and
connector J8 carries memory and control signals. To design an application
module, you must be familiar with the architecture and features of the
eZ80F91 Module currently installed.
Table 6 and Table 7 list the signals
and functions related to each of these connectors by pin. Power and
ground signals are omitted for the sake of simplicity.
Table 6. GPIO Connector J6*
Signal Pin # Function Direction Notes
SCL 5 I
2
C Clock IN/OUT
SDA 7 I
2
C Data IN/OUT
MOD_DIS 9 Modem Disable IN If a shunt is installed between
pins 6 and 9, the modem
function on the eZ80Acclaim!
®
Development Kit is disabled.
MWAIT 13 WAIT signal for
the CPU IN
EM_D0 15 Emulated, Bit 0 IN/OUT
CS3 17 Chip Select 3 of
the CPU OUT This signal is also present on
the J8.
EM_D[7:1] 21,23,25,
27,29,31,
33 Emulated, Bit
[7:1] IN/OUT
Reserved 35