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Caution in Setting the UART Noise Rejection Time

Product Types
TOSHIBA Microcontrollers TLCS-870 Family

With regard to the TLCS-870, TLCS-870/X and TLCS-870/C Series of Toshiba’s 8-bit microcontrollers listed above, please be informed that certain combinations of transfer clock frequency and noise rejection time should not be used in the UART (asynchronous serial interface) as explained below. If you need further information, please contact your local Toshiba sales representative.

Applicable Usage Conditions

This caution applies when the timer/counter interrupt is selected as a transfer clock of the UART and the transfer clock frequency (fc) and the RXD input noise rejection time are set to one of the combinations shown in the table below. Under any other conditions, the noise rejection can be used without any problem.

Problem

In receive operation (RXE=1), input data on the RXD pin may not be received properly.

Workaround

If you are using the UART with one of the above noise rejection time settings, disable the noise rejection or change the noise rejection time to a shorter period.

Product Types
TOSHIBA Microcontrollers TLCS-870 Family TLCS-870/X Series
  • TMP88CH40
  • TMP88CH40I
  • TMP88PH40
  • TMP88CH41
  • TMP88PH41
  • TMP88FH41
  • TMP88CS42
  • TMP88PS42
  • TMP88CS43
  • TMP88FW44
  • TMP88FW45
  • TMP88FW45A
  • TMP88F846
  • TMP88CH47
  • TMP88CK48
  • TMP88CM48
  • TMP88CS48A
  • TMP88CK49
  • TMP88CM49
  • TMP88C060

TOSHIBA Microcontrollers TLCS-870 Family TLCS-870/C Series
  • TMP86P202
  • TMP86P203
  • TMP86CH06
  • TMP86CH06A
  • TMP86PH06
  • TMP86C906
  • TMP86C407
  • TMP86C407I
  • TMP86C407S
  • TMP86C807
  • TMP86C807I
  • TMP86C807S
  • TMP86F807
  • TMP86P807
  • TMP86C408
  • TMP86C408I
  • TMP86C408S
  • TMP86C808
  • TMP86C808I
  • TMP86C808S
  • TMP86F808
  • TMP86P808
  • TMP86C908
  • TMP86C809
  • TMP86CH09
  • TMP86F409
  • TMP86F809
  • TMP86FH09
  • TMP86FH09A
  • TMP86C909
  • TMP86C912
  • TMP86CH12
  • TMP86FH12
  • TMP86C420
  • TMP86C820
  • TMP86P820
  • TMP86CH21
  • TMP86CH21A
  • TMP86C822
  • TMP86CH22
  • TMP86PH22
  • TMP86CP23
  • TMP86CP23A
  • TMP86CM23
  • TMP86CM23A
  • TMP86FS23
  • TMP86PM23
  • TMP86PS23
  • TMP86C923
  • TMP86FP24
  • TMP86CM25
  • TMP86CM25A
  • TMP86CS25
  • TMP86CS25A
  • TMP86FM25
  • TMP86PS25
  • TMP86C925
  • TMP86FM26
  • TMP86CM27
  • TMP86CP27A
  • TMP86FS27
  • TMP86PS27
  • TMP86C927
  • TMP86CS28
  • TMP86FS28
  • TMP86C829
  • TMP86C829A
  • TMP86C829B
  • TMP86CH29
  • TMP86CH29A
  • TMP86CH29B
  • TMP86CM29
  • TMP86CM29A
  • TMP86CM29B
  • TMP86CM29L
  • TMP86FM29
  • TMP86PM29
  • TMP86PM29A
  • TMP86PM29B
  • TMP86C929A
  • TMP86CS41
  • TMP86CS43
  • TMP86CS44
  • TMP86PS44
  • TMP86C944
  • TMP86C845
  • TMP86C846
  • TMP86CH46A
  • TMP86CM46A
  • TMP86FH46
  • TMP86FH46A
  • TMP86PH46
  • TMP86PM46
  • TMP86C847
  • TMP86C847I
  • TMP86C847S
  • TMP86CH47A
  • TMP86CH47I
  • TMP86CH47S
  • TMP86CM47A
  • TMP86FH47
  • TMP86FH47A
  • TMP86PH47
  • TMP86PM47
  • TMP86PM47A
  • TMP86C947
  • TMP86FM48
  • TMP86C948
  • TMP86CH49
  • TMP86CM49
  • TMP86CS49
  • TMP86FS49
  • TMP86FS49A
  • TMP86FS49AI
  • TMP86FS49B
  • TMP86PM49
  • TMP86C949
  • TMP86CS64
  • TMP86CS64A
  • TMP86FS64
  • TMP86PS64
  • TMP86C964
  • TMP86CH72
  • TMP86CM72
  • TMP86PM72
  • TMP86C972
  • TMP86CK74A
  • TMP86CM74A
  • TMP86PM74A
  • TMP86C974
  • TMP86CH87R
  • TMP86CM87R
  • TMP86PM87R
  • TMP86C987
  • TMP86C989
  • TMP86CH92I
  • TMP86CH92S
  • TMP86FH92
  • TMP86FH92I
  • TMP86FH93
  • TMP86C993

TOSHIBA Microcontrollers TLCS-870 Family TLCS-870 Series
  • TMP87CH29
  • TMP87CK29
  • TMP87CM29
  • TMP87PM29
  • TMP87CH48
  • TMP87CH48I
  • TMP87CM48
  • TMP87PH48
  • TMP87PM48
  • TMP87CM53
  • TMP87PM53
  • TMP87CS68
  • TMP87PS68

*Applicable products include all TLCS-870 Family microcontrollers with the UART function including custom products and products supplied as bare chips that are not listed above. If you have any questions, please contact your local Toshiba sales representative.

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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.