Rev. 1.00, 09/03, page 480 of 704
Table 17.2 Transfer Rate
Bit 3
Bit 2
Bit 1
Bit 0
Transfer Rate
CKS3 CKS2 CKS1 CKS0
Clock
φ
φ
φ
φ
= 8 MHz
φ
φ
φ
φ
= 10 MHz
φ
φ
φ
φ
= 20 MHz
0
φ
/28
286 kHz
357 kHz
714 kHz
0
1
φ
/40
200 kHz
250 kHz
500 kHz
0
φ
/48
167 kHz
208 kHz
417 kHz
0
1
1
φ
/64
125 kHz
156 kHz
313 kHz
0
φ
/168
47.6 kHz
59.5 kHz
119 kHz
0
1
φ
/100
80.0 kHz
100 kHz
200 kHz
0
φ
/112
71.4 kHz
89.3 kHz
179 kHz
0
1
1
1
φ
/128
62.5 kHz
78.1 kHz
156 kHz
0
φ
/56
143 kHz
179 kHz
357 kHz
0
1
φ
/80
100 kHz
125 kHz
250 kHz
0
φ
/96
83.3 kHz
104 kHz
208 kHz
0
1
1
φ
/128
62.5 kHz
78.1 kHz
156 kHz
0
φ
/336
23.8 kHz
29.8 kHz
59.5 kHz
0
1
φ
/200
40.0 kHz
50.0 kHz
100 kHz
0
φ
/224
35.7 kHz
44.6 kHz
89.3 kHz
1
1
1
1
φ
/256
31.3 kHz
39.1 kHz
78.1 kHz
17.3.2 I
2
C Bus Control Register B (ICCRB)
ICCRB issues start/stop conditions, manipulates the SDA pin, monitors the SCL pin, and controls
a reset in IIC control.
Bit Bit Name Initial Value R/W
Description
7 BBSY
0
R/W Bus
Busy
There are two functions: a flag function which indicates
whether the I
2
C bus is occupied or released and a function
which issues start and stop conditions in master mode.
This bit is set to 1 when the SDA level changes from high
to low under the condition of SCL = high, assuming that the
start condition has been issued. This bit is cleared to 0
when the SDA level changes from low to high under the
condition of SCL = high, assuming that the stop condition
has been issued. Write 1 to BBSY and 0 to SCP to issue a
start condition. Also follow this procedure when re-
transmitting a start condition. Write 0 to BBSY and 0 to
SCP to issue a stop condition. To issue a start/stop
condition, use the MOV instruction.
Содержание H8S/2437
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