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CHAPTER 17 UART
17.7
Operation of UART
UART operates in operation modes 0 and 2 for normal bidirectional serial
communication and in operation mode 1 for master-slave communication.
■
Operation of UART
●
Operation modes
There are three UART operation modes: modes 0 to 2. As listed in Table 17.7-1, an operation mode can be
selected according to the inter-CPU connection method and data transfer mode
Note:
Operation mode 1 of UART is used only from the master system during master-slave connection.
●
Inter-CPU connection method
One-to-one connection (normal mode) and master-slave connection (multiprocessor mode) can be selected.
For either connection method, the data length, whether to enable parity, and the synchronization method
must be common to all CPUs. Select an operation mode as follows:
•
In the one-to-one connection method, operation mode 0 or 2 must be used in the two CPUs. Select
operation mode 0 for asynchronous transfer mode and operation mode 2 for synchronous transfer mode.
•
Select operation mode 1 for the master-slave connection method and use it from the master system.
Select "When parity is disabled" for this connection method.
●
Synchronization method
Asynchronous mode (start-stop synchronization) or clock synchronous mode can be selected in different
operation modes.
●
Signal mode
UART can treat data only in NRZ (Non-return to Zero) format.
Table 17.7-1 UART Operation Mode
Operation mode
Data length
Synchronization mode Stop bit length
When parity is disabled
When parity is enabled
0
Normal mode
7 or 8 bits
Asynchronous
1 or 2 bits *2
1
Multiprocessor
8+1*1 bits
–
Asynchronous
2
Normal mode
8 bits
–
Synchronous
None
-: Setting not possible.
*1: "+1" indicates the address/data selection bit (A/D) for communication control.
*2: During reception, only one stop bit can be detected.
Содержание MB90460 Series
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Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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