Lantronix DSTni-EX manual Programmer’s Reference, I2C Controller Register Summary

Resetting the I2C Controller

There are two ways to reset the I2C controller.

Using the RSTIN# pin

Writing to the Software Reset register

Using the RSTIN# pin reset method:

Clears the Address, Extended Slave Address, Data, and Control registers to 00h. Sets the Status register to F8h.

Sets the Clock Control register to 00h.

Writing any value to the Software Reset register:

Sets the I2C controller back to idle.

Sets the STP, STA, and IFLG bits of the Control register to 0.

Programmer’s Reference

The DSTni I2C controller base address is D000h. The controller shares interrupt 2 with the SPI

controller. The I2C bus interface requires two bidirectional buffers, with open collector (or open drain) outputs and Schmitt inputs.

I2C Controller Register Summary

The A[2:0] address lines of the microprocessor interface provide access to the 8-bit registers in Table 3-7.

On a hardware reset:

Address, Extended Slave Address, Data, and Control register clear to 00h. The Status register is set to F8h.

The Clock Control register is set to 00h.

On a software reset, the STP, STA and IFLG bits of the Control register are set to zero.

				Table 3-7. I2C Controller Register Summary
	A[2:0] Bits				Hex	Mnemonic	Register Description	Page
A2		A1	A0		Offset
0		0	0		D000	ADDR	Slave Address register	23
0		0	1		D002	DATA	Data register	24
0		1	0		D004	CNTR	Control register	25
0		1	1		D006	STAT	Status register	26
0		1	1		D007	CCR	Clock Control register	28
1		0	0		D008	XADDR	Extended Slave Address register	29
1		1	1		D00E	SRST	Software Reset register	29

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