Chapter 13
Serial Interface
Full-duplex UART Communication
XIII - 49
Setting of Transfer Clock (SCnCLK)
SCIFn operates with SCnCLK which is generated based on BRTM output clock (BRTM_SCnCLK).
Regardless of the setting value of SCnMD1.SCnCKM, SCnCLK is as follows:
When SCnMD1.SCnDIV is "0", SCnCLK is generated by dividing BRTM_SCnCLK by 8.
When SCnMD1.SCnDIV is "1", SCnCLK is generated by dividing BRTM_SCnCLK by 16.
Generating Baud Rate Timer Output Clock (BRTM_SCnCLK)
This is a common feature with the Clock-Synchronous communication. For more information, refer to XIII-30.
Transmission Data Buffer (TXBUFn) and Transmission Buffer Empty Flag (SCnTEMP)
This is a common feature with the Clock-Synchronous communication. For more information, refer to XIII-35.
..
Write data to TXBUFn only when SCnSTR.SCnTEMP is "0".
If data is written to TXBUFn while SCnTEMP is "1", SCIFn does not work properly.
..
..
As in the Clock-Synchronous communication, a wait time (T
wait
) from a data write to TXBUFn
to the first data transmission is the period of 3.5 transfer clocks.
(A start bit is transmitted after 2.5 transfer clocks after a data is written to TXBUFn.)
..
Reception Data Buffer (RXBUFn) and of Reception Buffer Empty Flag (SCnREMP)
This is a common feature with the Clock-Synchronous communication. For more information, refer to XIII-35.
Activation Source for Communication
Data write to TXBUFn is the trigger to start data transmission.
In data reception, a communication starts with a detection of start bit.
"Low"
level input time of 0.5 transfer clock
or more is required for a detection of start bit.
Interrupt
In data transmission, transmission complete interrupt (SCnTIRQ) occurs every 1-frame transmission completion.
In data reception, reception complete interrupt (SCnRIRQ) occurs every 1-frame reception completion.
Summary of Contents for MN101L Series
Page 1: ...Cover MICROCOMPUTER MN101L MN101LR05D 04D 03D 02D LSI User s Manual Pub No 21705 015E ...
Page 2: ......
Page 8: ......
Page 10: ......
Page 11: ...Contents Contents 0 ...
Page 22: ... Contents 11 ...
Page 23: ...I Chapter 1 Overview 1 ...
Page 62: ...Chapter 1 Overview I 40 Cautions for Circuit Setup ...
Page 63: ...II Chapter 2 CPU 2 ...
Page 94: ...Chapter 2 CPU II 32 Reset ...
Page 95: ...III Chapter 3 Interrupts 3 ...
Page 143: ...IV Chapter 4 Clock Mode Voltage Control 4 ...
Page 175: ...V Chapter 5 Watchdog Timer WDT 5 ...
Page 180: ...Chapter 5 Watchdog Timer WDT V 6 Operation ...
Page 181: ...VI Chapter 6 Power Supply Voltage Detection 6 ...
Page 189: ...VII Chapter 7 I O Port 7 ...
Page 248: ...Chapter 7 I O Port VII 60 Port 8 ...
Page 249: ...VIII Chapter 8 8 bit Timer 8 ...
Page 282: ...Chapter 8 8 bit Timer VIII 34 8 bit Timer Cascade Connection ...
Page 283: ...IX Chapter 9 16 bit Timer 9 ...
Page 346: ...Chapter 9 16 bit Timer IX 64 IGBT Output with Dead Time ...
Page 347: ...X Chapter 10 General Purpose Time Base Free Running Timer 10 ...
Page 361: ...XI Chapter 11 RTC Time Base Timer RTC TBT 11 ...
Page 371: ...XII Chapter 12 Real Time Clock RTC 12 ...
Page 389: ...XIII Chapter 13 Serial Interface 13 ...
Page 458: ...Chapter 13 Serial Interface XIII 70 IIC Communication ...
Page 459: ...XIV Chapter 14 DMA Controller 14 ...
Page 472: ...Chapter 14 DMA Controller XIV 14 DMA Data Transfer ...
Page 473: ...XV Chapter 15 Buzzer 15 ...
Page 479: ...XVI Chapter 16 A D Converter ADC 16 ...
Page 493: ...XVII Chapter 17 LCD 17 ...
Page 530: ...Chapter 17 LCD XVII 38 LCD Display Examples ...
Page 531: ...XVIII Chapter 18 ReRAM 18 ...
Page 538: ...Chapter 18 ReRAM XVIII 8 Command Library ...
Page 539: ...XIX Chapter 19 On Board Debugger 19 ...
Page 542: ...Chapter 19 On Board Debugger XIX 4 List of on board debugging functions ...
Page 543: ...XX Chapter 20 Appendix 20 ...