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[Previous] [Up] [Top] [Contents] [Back]5.4 Local Memory Map
The X24C04 is a 512-byte EEPROM with a serial data interface. All address lines are connected to ground. The clock input is programmed via the OP6~ output line of the DUART. The data input line of the EEPROM is connected to the OP5~ output line and the data output from the EEPROM to the IP5~ input line of the DUART.
NOTE: The OP5~ output must be '1' before valid data can be read from the IP5~ input.
A software protocol is used to read and write the contents of the EEPROM, as discussed in the X24C04 data sheet.
The DUART output lines can be individually programmed by writing to the 'Set Output Port Bits' register ($30001D) or the 'Clear Output Port Bits' register ($30001F). The data written to these registers determine which output lines will be affected. OP5 is affected when writing $20 and OP6 when writing $40. The IP5 input can be read at bit position 5 from the input port register at $30001B.
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