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Resetting the I
2
C Controller
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.
Programmer’s Reference
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.
I
2
C 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. I
2
C Controller Register Summary
A[2:0] Bits Page
A2 A1 A0
Hex
Offset
Mnemonic Register Description
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