Holtek BS83A04C Manual page 88

SCL
SDA
SCL
SDA
When an I C time-out counter overflow occurs, the counter will stop and the IICTOEN bit will be
2
cleared to zero and the IICTOF bit will be set high to indicate that a time-out condition has occurred.
The time-out condition will also generate an interrupt which uses the I
I C time-out occurs, the I
2
following condition:
The IICTOF flag can be cleared by the application program. There are 64 time-out periods which
can be selected using IICTOS bit field in the IICTOC register. The time-out time is given by the
formula: [(1~64)×32]/f
• IICTOC Register
Bit 7
Name IICTOEN
R/W R/W
POR 0
IICTOEN: I
Bit 7
0: Disable
1: Enable
IICTOF: I
Bit 6
0: No time-out occurred
1: Time-out occurred
IICTOS5~IICTOS0: I
Bit 5~0
I C time-out clock source is f
2
I C time-out time is equal to (IICTOS[5:0]+1)×(32/f
2
Rev. 1.00
4-Key Enhanced Touch I/O Flash MCU
Start Slave Address
1 0 1 1
1 0 0 1 0
2
I C time-out counter reset
on SCL negative transition
I C Time-out
2
C internal circuitry will be reset and the registers will be reset into the
2
Registers
IICD, IICA, IICC0
IICC1
I C Registers after Time-out
2
. This gives a time-out period which ranges from about 1ms to 64ms.
SUB
6 5 4
IICTOF IICTOS5 IICTOS4
R/W R/W R/W
0 0 0
C Time-out control
2
C Time-out flag
2
C Time-out period selection
2
/32.
SUB
88
SRW ACK
0 1 0 1 0
2
I C time-out
counter start
Stop
1 0 0
C interrupt vector. When an
2
After I C Time-out
2
No change
Reset to POR condition
3 2
IICTOS3 IICTOS2 IICTOS1
R/W R/W R/W
0 0
).
SUB
BS83A04C
1 0
IICTOS0
R/W
0 0
March 24, 2020