Intel CONTROLLERS 413808 - Manual (Page 713)

Intel ® 413808 and 413812 I/O Controllers in TPER Mode
October 2007 Developer’s Manual
Order Number: 317805-001US 713
I 2 C Bus Interface Units—Intel ® 413808 and 413812
14.7 Reset Conditions
The I
2
C unit is reset with internal bus reset. Software is responsible for ensuring the
I
2
C unit is not busy (ISR[3]) before asserting reset. Software is also responsible for
ensuring the I
2
C bus is idle when the unit is enabled after reset. When directed to
reset, the I
2
C unit returns to its default reset condition with the exception of the ISAR.
ISAR is not affected by a reset.
When the Unit Reset bit in the ICRx is set, only the 4138xx I
2
C unit resets, the
associated I
2
C MMRs remain intact. When resetting the I
2
C unit with the ICRx unit
reset, use the following guidelines:
1. In the ICRx register, set the reset bit and clear the remainder of the register.
2. Clear the ISRx register.
3. Clear reset in the ICRx.