EZ80F915005MOD Datasheet, PDF (16/25 Pages) Zilog, Inc. – eZ80F91 Mini Enet Module

eZ80F915005MOD
eZ80F91 Mini Enet Module Product Specification
11
5MHz Clock
The eZ80F91 Mini Enet Module contains a 5MHz crystal oscillator (Y2) that is
multiplied by the phase-locked loop in the eZ80F91 MCU to create a 50MHz sys-
tem clock
Memory
The eZ80F91 MCU contains 256KB of internal Flash memory. Additional user
memory can be accommodated via the system bus on connectors J1 and J2. To
program the on-chip Flash memory, install jumper JP1 on the mini module. See
Table 3.
Table 3. Shunt JP1, eZ80F91 Mini Enet Module
Shunt
Symbol Jumper Name Status
Function
Affected Device
JP1 F91_WE
In (Default) On-chip Flash is enabled for
writing to boot block.
On-chip Flash
Out
On-chip Flash memory boot block On-chip Flash
is write-protected.
There is 128 KB of fast SRAM on the eZ80F91 Mini Enet Module. Access time is
12 ns, which requires one wait-state access. The eZ80F91 on-chip SRAM can be
used with zero wait states.
IrDA Transceiver
The eZ80F91 Mini Enet Module is shipped without an IrDA transceiver installed.
If you install an on-board transceiver, such as the ZiLOG ZHX1810, it is connected
to PD0 (TX), PD1 (RX), and PD2 (Shutdown, IR_SD). The IrDA transceiver is of
the LED type 870 nm Class 1.
The IrDA transceiver is accessible via the IrDA controller attached to UART0 on
the eZ80F91 device.
To use the UART0 for console or to save power, the transceiver can be disabled
by the software or by an off-board signal when using the proper jumper selection.
The transceiver is disabled by setting PD2 (IR_SD) High or by pulling the
PS023602-0804
PRELIMINARY
Onboard Component Description