EZ80F915050MOD Datasheet, PDF (22/34 Pages) Zilog, Inc. – eZ80F91 Module compact, high-performance Ethernet module

eZ80F915050MOD
eZ80F91 Module Product Specification
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Table 5. Flash Memory Programming Signals and Jumpers
Signal/Jumper
DIS_FLASH
FlashWE
JP3
F91_WE
Function
State/Status
Controls Read/Write access to eZ80F91 Module external Flash When Low, access
memory
is enabled
Controls Write operations to the boot block of eZ80F91 Module When Low, Write is
external Flash memory
enabled
Controls Write access to eZ80F91 MCU on-chip Flash memory When IN, Write is
enabled
Controls Write access to eZ80F91 MCU on-chip Flash memory When Low, Write is
enabled
The eZ80F91 Module’s external Flash memory has an access time of 100 ns. At
least five wait states must be added to the cycle when accessing external Flash at
the 50MHz clock speed. eZ80F91 MCU on-chip Flash is faster; its minimum
access time is 60 ns, which requires only three wait states at 50 MHz.
There is 512 KB of fast SRAM on the eZ80F91 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
An onboard IrDA transceiver (ZiLOG ZHX1810) is connected to PD0 (TX), PD1
(RX), and PD2 (Shutdown, R_SD). The IrDA transceiver is of the LED type
870 nm Class 1.
The receiver supply current is 90–150 µA and the transmitter supply current is
260 mA when the LED is active.The IrDA transceiver is accessible via the IrDA
controller attached to UART0 on the eZ80F91 device. The UART0 console and
the IrDA transceiver cannot be used simultaneously.
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
DIS_IRDA pin on the I/O connector Low. The shutdown is used for power savings.
To enable the IrDA transceiver, DIS_IRDA is left floating and PD2 is set to Low.
Reset Generator
The onboard Reset Generator Chip performs reliable Power-On Reset. The chip
generates a reset pulse with a duration of 200 ms if the power supply drops below
PS019310-0904
PRELIMINARY
Onboard Component Description