(4)
Detection control of data "0" in the reception period
The detection width can be set with
UARTxHCCR
<HCZR[2:0]>. The width is one that the data
is recognized as "0" against width of one bit in 100% duty.
After a falling edge of data of "0" is detected, if "0" level continues over than the specified detec-
tion width, the data is captured as data of "0".
If data of "0" level is less than the specified width, the data is not recognized as "0".
Note that even when data of "0" level continues over than the specified detection width, if the
noise which is over the width of UARTCLK occurs, the data is not recognized as "0".
The following figure shows an example where the detection width is set to 3/16 width.
0
0
UTxRXD50
UTxRXD
Over 3/16
Less than 3/16
Noise over than the width of UARTCL
K
Width of 3/16
Not recognized as "0"
.
Figure 11-7 Example of data "0" detection period
(5)
The loop-back test control
When "1" is set to
UARTxHCCR
<HCLPB>, the loop-back test control is enabled. At this time,
UTxTXD50A and UTxTXD50B are internally connected to UTxRXD50; therefore,
TMPM3V6/
M3V4
can singly check transmit/receive operation.
UTxTXD50A and UTxTXD50B are ANDed. The result is sent to UTxRXD50.
1
0
UTxRXD50
UTxTXD50A
UTxTXD50B
UTxRXD50
UTxTXD50A
UTxTXD50B
UARTxHCCR<HCLPB>
Figure 11-8 Connection in the loop-back test
Note 1: The loop-back test control is the test function in the development stage. Do not use for the final products.
Note 2: In 50% duty mode, full-duplex communication is only allowed when the loop-back test is enabled. Do
not perform full-duplex communication except when the loop-back test is enabled.
Note 3: When the loop-back test is enabled, do not enter the external signal to the UART.
TMPM3V6/M3V4
Page 209
2019-02-06
Summary of Contents for TMPM3V4
Page 1: ...32 Bit RISC Microcontroller TX03 Series TMPM3V6 M3V4 ...
Page 2: ... 2019 Toshiba Electronic Devices Storage Corporation ...
Page 7: ...Revision History Date Revision Comment 2019 02 06 1 First Release ...
Page 8: ......
Page 22: ...xiv ...
Page 52: ...TMPM3V6 M3V4 3 Processor Core 3 6 Exclusive access Page 30 2019 02 06 ...
Page 148: ...TMPM3V6 M3V4 7 Exceptions 7 6 Exception Interrupt Related Registers Page 126 2019 02 06 ...
Page 178: ...TMPM3V6 M3V4 9 Input Output port 9 2 Block Diagrams of Ports Page 156 2019 02 06 ...
Page 354: ...TMPM3V6 M3V4 14 Synchronous Serial Port SSP 14 6 Frame Format Page 332 2019 02 06 ...
Page 419: ...TMPM3V6 M3V4 Page 397 2019 02 06 ...
Page 462: ...TMPM3V6 M3V4 21 Watchdog Timer WDT 21 5 Control register Page 440 2019 02 06 ...
Page 544: ......