418
CHAPTER 21 400 kHz I
2
C INTERFACE
■
SCC, MSS and INT Bit Competition
Simultaneously writing to the SCC, MSS and INT bits causes a competition to transfer the next byte, to
generate a repeated start condition or to generate a stop condition. In these cases the order of priority is as
follows:
•
Next byte transfer and stop condition generation.
When "0" is written to the INT bit and "0" is written to the MSS bit, the MSS bit takes priority and a
stop condition is generated.
•
Next byte transfer and start condition generation.
When "0" is written to the INT bit and "1" is written to the SCC bit, the SCC bit takes priority. A
repeated start condition is generated and the contents of the IDAR register is sent.
•
Repeated start condition generation and stop condition generation.
When a "1" is written to the SCC bit and "0" to the MSS bit, the MSS bit clearing takes priority. A stop
condition is generated and the interface enters slave mode.
Notes:
•
Note on using MB90F394H(A), MB90V390H only.
If there are some other master mode LSIs on the bus, the device can not be used as the master
mode.
- Example of usable configuration
- Example of unusable configuration
MB90F394H
MB90
V
390H
Master
Sla
v
e A
Sla
v
e B
I
2
C
bu
s
MB90F394H
MB90
V
390H
Master A
Sla
v
e A
Sla
v
e
I
2
C
bu
s
MB90F394H
MB90
V
390H
Master
Sla
v
e A
Master A
I
2
C
bu
s
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
Страница 18: ...xiv ...
Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
Страница 722: ...694 APPENDIX ...
Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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