M37517F8HP Datasheet, PDF (31/98 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7517 Group
I²C additional function register
(1) bit 0: Time-out mode bit (TOM)
Setting the time-out mode bit “1” , continuity of I²C-Bus busy
state for about 125 ms (XIN = 8 MHz) makes time-out flag “1”
and time-out interrupt. Restart condition resets the time-out
timer.
(2) bit 1: Time-out flag (TOF)
Time-out flag becomes “1” when the time-out state occurs.
Writing “1” to this bit, time-out timer is reset, and this bit is
cleared “0” also.
(3) bit 2: SM-Bus interface pin input threshold select bit (TIS2)
The SM-Bus interface pin input threshold is selected by this bit.
Setting this bit “0”, the SM-Bus interface pin input threshold is
for SM-Bus Ver1.0 specification, and setting this bit “1”, it is for
SM-Bus Ver1.1 specification.
(4) Stop condition flag (SCF)
This flag turns to “1”, when the stop condition is generated or
detected. This bit is cleared “0” at reset, or when I²C-Bus inter-
face enable bit is “0” or writing this bit “1”. This bit is available
when I²C-Bus interface enable bit is “1”.
b7
b0
I²C additional function register
(S3 : address 003116)
Time-out mode bit (TOM)
0 : disable
1 : enable
Time-out flag (TOF)
0 : Not generated
1 : Generated
*Writing this bit “1”, this flag is cleared to “0”.
SM-Bus interface pin input threshold select bit (TIS2)
0 : Ver1.0 (VIL=0.6V,VIH=1.4V)
1 : Ver1.1 (VIL=0.8V,VIH=2.1V)
Stop condition flag (SCF)
0 : Not detect stop condition
1 : Detect stop condition
*Writing this bit “1”, this flag is cleared to “0”.
Not used (returns “0” when read)
Fig. 35 I²C additional function register
Rev.1.01 Aug 02, 2004 page 31 of 96