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AN-895

Rev. 0 | Page 16 of 16

IMPLEMENTATION OF THE SERIAL EEPROM

PROTOCOL

This section covers the implementation of the five commands

supported by the serial EEPROM specifications in the case of a

single I

C address:

• Current address read

• Random read

• Random write

• Sequential read

• Sequential write

In the interrupt service routine, the status register must be read

once and its value saved. The flowchart of the interrupt service

routine is shown in

Figure 22.

FALSE

TRUE

BIT 2 SET

READ

BIT 3 SET

WRITE

BIT 10 SET

STOP

STATUS

FIRST

I2C0STX=

DAT[++BYTE ADDR]

FIRST = TRUE

FIRST = FALSE

BYTE_ADDR=

I2C0SRX

FLUSH T

FIFO

I2C0STX=

DAT[BYTE_ADDR]

I2C0STX=

DAT[++BYTE_ADDR]

FLUSH T

FIFO

GET DATA

RETURN

Figure 22. Slave Interrupt Service Routine

See AN-895 Companion Code.zip for companion codes.

Command Codes

C Configuration

I2CCFG = 0x4001; // Enable slave, enable STOP detect

I2C0ID0 = 0xA0; // Slave ID

I2C0STX = dat[0]; // Set initial data

Variable Initialization

Byte_addr = 0

First = 1

Enable I

C Slave Interrupt

IRQEN = 0x200; // I2C0 Slave Interrupt

while (1) // Wait for interrupt

Purchase of licensed I

C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I

C Patent

Rights to use these components in an I

C system, provided that the system conforms to the I

C Standard Specification as defined by Philips.

registered trademarks are the property of their respective owners.

AN06549-0-1/07(0)

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