Rev. 1.60 162 August 20, 2019 Rev. 1.60 163 August 20, 2019
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
START signal
from M aste r
Send s la ve addre ss
and R/W bit from M aste r
A cknow le dge
from s la ve
S end data byte
from M aste r
A cknow l edge
from s la ve
STOP s ig nal
from M aste r
The SIMDEB1 and SIMDEB0 bits determine the debounce time of the I
2
C interface. This uses
the system clock to in effect add a debounce time to the external clock to reduce the possibility
of glitches on the clock line causing erroneous operation. The debounce time, if selected, can be
chosen to be either 2 or 4 system clocks. To achieve the required I
2
C data transfer speed, there
exists a relationship between the system clock, f
SYS
, and the I
2
C debounce time. For either the I
2
C
Standard or Fast mode operation, users must take care of the selected system clock frequency and
the congured debounce time to match the criterion shown in the following table.
I
2
C Debounce Time Selection I
2
C Standard Mode (100kHz) I
2
C Fast Mode (400kHz)
No Devounce f
SYS
> 2MHz f
SYS
> 5MHz
2 system clock debounce f
SYS
> 4MHz f
SYS
> 10MHz
4 system clock debounce f
SYS
> 8MHz f
SYS
> 20MHz
I
2
C Minimum f
SYS
Frequency
I
2
C Registers
There are three control registers associated with the I
2
C bus, SIMC0, SIMC1 and SIMA, and one
data register, SIMD. The SIMD register, which is shown in the above SPI section, is used to store
the data being transmitted and received on the I
2
C bus.
Note that the SIMA register also has the name SIMC2 which is used by the SPI function. Bit SIMEN
and bits SIM2~SIM0 in register SIMC0 are used by the I
2
C interface.
Register
Name
Bit
7 6 5 4 3 2 1 0
SIMC0 SIM2 SIM1 SIM0 — SIMDEB1 SIMDEB0 SIMEN SIMICF
SIMC1 HCF HAAS HBB HTX TXAK SRW IAMWU RXAK
SIMA IICA6 IICA5 IICA4 IICA3 IICA2 IICA1 IICA0 D0
SIMD D7 D6 D5 D4 D3 D2 D1 D0
SIMTOC SIMTOEN SIMTOF SIMTOS5 SIMTOS4 SIMTOS3 SIMTOS2 SIMTOS1 SIMTOS0
I
2
C Registers List
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