Fujitsu FR81S ユーザーズマニュアル
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
5. Operation of UART
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
165
If the transmission data register (TDR) has valid transmission data (SSR:TDRE="0") after the data
transmission is completed as many as the number of data set to TBYTE, the transmission data will not be
sent until the edge of the external trigger which is set with the trigger selection bit (SACSR:TRG1, 0) is
detected next time.
However, if the synchronous transmission is enabled (SACSR:TSYNE="1") and the edge of the external
trigger which is set with the trigger selection bit (SACSR:TRG1, 0) is detected, the transmission will not be
stopped and the next transmission will be started after sending as much data as TBYTE0.
⋅
Transmission operation in progress (SSR:TBI="0")
Notes:
When the transmit data register (TDR) has no valid transmission data (SSR:TDRE="1") before
sending the data frame of TBYTE setting, the following operation will be performed.
⋅
Transmission operation will be stopped until transmission data is written to the transmission data
register (TDR). Transmission operation will be restarted when transmission data is written to the
transmission data register (TDR).
MB91520 Series
MN705-00010-1v0-E
1478