Fujitsu FR81S Benutzerhandbuch
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
8. Operation of I2C
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
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Reload Values Relating to Baud Rates and Internal Clock Frequencies
Table 8-2 Reload Values Relating to Baud Rates and Internal Clock Frequencies
Baud rate
[bps]
Internal clock (peripheral clock (PCLK))
8MHz
10MHz
16MHz
20MHz
24MHz
32MHz
400000
19
24
39
49
59
79
200000
39
49
79
99
119
159
100000
79
99
159
199
239
319
These numerical values apply when SCL rising of the I
2
C bus is 0s. When SCL rising of the I
2
C bus is slow,
the baud rate becomes lower than the above numerical values.
Reload Counter Functions
The reload counter consists of a 15-bit register for reload values and generates a transmission/reception
clock from the internal clock. In addition, the count value of the transmission reload counter can be read via
the baud rate generator register (BGR).
Count Start
When a reload value is written to the baud rate generator register (BGR), the reload counter will start
counting.
MB91520 Series
MN705-00010-1v0-E
1644