Zilog EZ80F91 - Manual (Page 36)

eZ80F91 Development Kit
User Manual
UM014220-0508 eZ80 Development Kit
31
Chip Selects and Wait States— As seen in the memory map in
Figure 10 , Flash memory is enabled by CS0, on-module SRAM is
enabled by CS1, and the remainder of the resources are enabled by CS2.
The number of wait states (N) for each Chip Select are indicated in
Table 14 .
LEDs
As mentioned in Table 13 , LEDs D1, D2, D3, and D4 function as status
indicators for an optional modem. This section describes each LED and
the LED matrix device.
LED Matrix
The 7 x 5 LED matrix device on the eZ80Acclaim!
®
Development Kit is a
memory-mapped device that can be used to display information, such as
programmed alphanumeric characters. For example, the LED display
sample program that is shipped with this kit displays the alphanumeric
message:
eZ80
To illuminate any LED in the matrix, its respective anode bit must be set
to 1 and its corresponding cathode bit must be set to 0.
Table 14. Chip Select Wait States
Memory Type CS0 CS1 CS2 CS3
Flash N = 7 * * *
On-module SRAM * N = 1 * *
eZ80Acclaim!
®
Development Kit SRAM
and other resources
* * N = 2 *
Note: *Not applicable for these resources.