Sundance Spas ST201 - Manual (Page 85)

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Sundance Technology ST201 PRELIMINARY draft 2
EXPROMDATA
Class....................I/O Registers, External Interface Control
Base Address ......IoBaseAddress register value
Address Offset .....0x44
Access Mode .......Read/Write
Width ...................8 bits
ExpRomData is the data port for performing direct I/O byte-wide accesses of the Expansion ROM. A read
of ExpRomData returns the ROM byte value from the location specified by ExpRomAddr. A write to
ExpRomData causes the write data to be programmed into the ROM location specified by ExpRomAddr.
Note: The Atmel EPROM devices supported by ST201 must be programmed in 64-byte pages. Refer to
the Atmel Flash Memory Device data book for information on programming EPROMs.
BIT BIT NAME BIT DESCRIPTION
15..0 ExpRomData Data read from, or to be written to, expansion ROM.