Lantronix DSTni-EX Benutzerhandbuch

22 

There are two ways to reset the I

2

C 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 I

2

C controller back to idle. 

 

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

The DSTni I

2

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

controller. The I

2

C bus interface requires two bidirectional buffers, with open collector (or open 

drain) outputs and Schmitt inputs. 

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. 

0 

0 

0 

D000 

ADDR 

Slave Address register 

0 

0 

1 

D002 

DATA 

Data register 

0 1  0 D004 

CNTR 

Control 

register 

0 

1 

1 

D006 

STAT 

Status register 

0 

1 

1 

D007 

CCR 

Clock Control register 

1 

0 

0 

D008 

XADDR 

Extended Slave Address register 

1 

1 

1 

D00E 

SRST 

Software Reset register