2.

The EDOSK2674 is designed around a H8/2674R MCU and includes FLASH memory, SDRAM, real-time clock, an

interface to a local expansion card, an interface for IO connections, a serial port and a LAN port.

The figure below shows the block diagram of the EDOSK2674 board.

H8S

2674R

LQFP144

SDRAM

8MByte

Boot

FLASH

512KByte

Main

FLASH

4MByte

LAN

10Mbps

RTC

RS232

XTAL

&

BATT

Expansion Connector

Memory Mapped Peripherals

RJ45

DB9

(Female)

Auxiliary I/O Connector

I/O Peripherals

Power

Jack

3.3v Reg

x2

The EDOSK hardware requires a power supply of +5V. Since total power consumption can vary widely due to external

connections, port states, and memory configuration, use a power supply capable of providing at least 500mA at +5V DC ±

5%.

The design is specified for evaluation of the MCU and so does not include circuitry for supply filtering/noise reduction, under

voltage protection, over current protection or reversed polarity protection. Caution should be used when selecting and using

a power supply.

The power connector on the EDOSK is a 2.5mm Barrel connector. The center pin is the positive connection.

Caution: Existing customers using E6000 products note that the polarity of this board is opposite to that for the

E6000. Use of the E6000 power supply with this board will damage both board and power supply.

The H8/2674R has only two modes of operation set by jumper configuration:

Mode 1: (MD2=0, MD1=0, MD0=1) Advanced, External Data Bus initial Width is 16 bits. – EDOSK NORMAL mode.

Mode 2: (MD2=0, MD1=1, MD0=0) Advanced, External Data Bus initial Width is 8 bits. – EDOSK BOOT mode.

The H8/2674R has no internal Flash memory. On power-up the EDOSK mode (Boot or Normal) selects the Flash memory

from which the H8/2674R first accesses.

7