Holtek HT66F488 Manual page 130

S C L
S D A
S C L
S D A
When an I C time-out counter overflow occurs, the counter will stop and the SIMTOEN bit will
2
be cleared to zero and the SIMTOF 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
When an I C time-out occurs, the I
2
into the following condition:
SIMD� SIMA� SIMC�
SIMC1
The SIMTOF flag can be cleared by the application program. There are 64 time-out period selections
which can be selected using the SIMTOS bits in the SIMTOC register. The time-out duration is
calculated by the formula: ((1~64) × (32/f
about 1ms to 64ms.
SIMTOC Register
Bit 7
�a�e SIMTOE�
R/W R/W
POR �
Bit 7 SIMTOEN: I
0: Disable
1: Enable
Bit 6 SIMTOF: I
0: No time-out occurred
1: Time-out occurred
Bit 5~0 SIMTOS5~SIMTOS0: I
I C Time-out clock source is f
2
I C Time-out time is given by: (SIMTOS [5:0] +1) × (32/f
2
Rev. 1.21
S t a r t S l a v e A d d r e s s
0 1
1 1
1 0 0 1 0
2
I C t i m e - o u t c o u n t e r r e s e t
o n S C L n e g a t i v e t r a n s i t i o n
I C Time-out
2
C internal circuitry will be reset and the registers will be reset
2
Register
I C Registers after Time-out
2
)). This gives a time-out period which ranges from
SUB
6 5
SIMTOF SIMTOS5 SIMTOS4 SIMTOS3 SIMTOS2 SIMTOS1 SIMTOS�
R/W R/W R/W
� �
C Time-out Control
2
C Time-out flag
2
C Time-out Time Selection
2
/32
SUB
13�
HT66F488/HT66F489
A/D Flash MCU with EEPROM
S R W
A C K
0 1 0 1 0
2
I C t i m e - o u t
c o u n t e r s t a r t
1 0 0
After I C Time-out
2
�o change
Reset to POR condition
4 3 2
R/W R/W
� � �
)
SUB
�ove��e� ��� 2�1�
S t o p
C interrrupt vector.
2
1 0
R/W R/W
� �