ML620Q503/Q504 User's Manual
Chapter 15 I
2
C Bus Interface
FEUL620Q504 15–9
•
I2nDW1-0
(bits 3 to 2)
The I2nDW1-0 bits are used to set the communication speed reduction rate of the I
2
C bus interface. Set
this bit so that the communication speed does not exceed 100kbps/400kbps.
I2nDW1
I2nDW0
Description
0
0
No communication speed reduction (initial value)
0
1
10% communication speed reduction
1
0
20% communication speed reduction
1
1
30% communication speed reduction
•
I2nCD1-0
(bits 9 to 8)
The I2nCD1-0 bits are used to set the operating frequency of I
2
C. Set a frequency division value of
OSCLK. Make sure that the clock input to I
2
C is 4MHz or less. Proper operation cannot be guaranteed if
the frequency division value exceeds 4MHz. Table 15-1 shows the relationship between the setting
values of OSCLK, I2nCD1, and I2nCD0 and the communication speed.
I2nCD1
I2nCD0
Description
0
0
OSCLK
0
1
1/2OSCLK
1
0
1/4OSCLK (initial value)
1
1
Setting prohibited
Table 15-1 Relationship between OSCLK and Communication Speeds
OSCLK
I2nCD1
I2nCD0
I2C operating frequency
Standard
mode
Fast mode
16MHz
0
0
Setting prohibited
–
–
0
1
Setting prohibited
–
–
1
0
4MHz
100kbps
400kbps
1
1
Setting prohibited
–
–
8MHz
0
0
Setting prohibited
–
–
0
1
4MHz
100kbps
400kbps
1
0
2MHz
50kbps
200kbps
1
1
Setting prohibited
–
–
4MHz
0
0
4MHz
100kbps
400kbps
0
1
2MHz
50kbps
200kbps
1
0
1MHz
25kbps
100kbps
1
1
Setting prohibited
–
–
[Note]
Do not change this bit during I
2
C communication. Operation is not guaranteed if it is changed.
Содержание LAPIS SEMICONDUCTOR ML620Q503
Страница 2: ...ML620Q503 Q504 User s Manual Issue Date Apr 16 2015 FEUL620Q504 01...
Страница 18: ...Chapter 1 Overview...
Страница 32: ...Chapter 2 CPU and Memory Space...
Страница 44: ...Chapter 3 Reset Function...
Страница 50: ...Chapter 4 Power Management...
Страница 70: ...Chapter 5 Interrupts...
Страница 134: ...Chapter 6 Clock Generation Circuit...
Страница 161: ...Chapter 7 Time Base Counter...
Страница 170: ...Chapter 8 Timers...
Страница 183: ...Chapter 9 Function Timer FTM...
Страница 231: ...Chapter 10 Watchdog Timer...
Страница 239: ...Chapter 11 Synchronous Serial Port SSIO...
Страница 251: ...Chapter 12 Synchronous Serial Port with FIFO SSIOF...
Страница 283: ...Chapter 13 UART...
Страница 303: ...Chapter 14 UART with FIFO UARTF...
Страница 327: ...Chapter 15 I2 C Bus Interface...
Страница 344: ...Chapter 16 Port XT...
Страница 350: ...Chapter 17 Port 0...
Страница 361: ...Chapter 18 Port 1...
Страница 368: ...Chapter 19 Port2...
Страница 379: ...Chapter 20 Port 3...
Страница 395: ...Chapter 21 Port 4...
Страница 410: ...Chapter 22 Port 5...
Страница 426: ...Chapter 23 Melody Driver...
Страница 439: ...Chapter 24 RC Oscillation type A D Converter RC ADC...
Страница 462: ...Chapter 25 Successive Approximation Type A D Converter SA ADC...
Страница 479: ...Chapter 26 Analog Comparator...
Страница 489: ...Chapter 27 Flash Memory Control...
Страница 505: ...Chapter 28 Voltage Level Supervisor VLS...
Страница 517: ...Chapter 29 LLD circuit...
Страница 519: ...Chapter 30 On Chip Debug Function...
Страница 522: ...Appendixes...
Страница 552: ...Revision History...