TMP86PS44UG Datasheet, PDF (143/180 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

TMP86PS44UG
TDBUF
Shift register
TXD pin
UARTSR<TBEP>
INTTXD interrupt
xxxx
Data write
yyyy
*****¹
1xxxx0
*^1xxxx
Start
Bit 0
****^1x
Final bit
*****¹
Stop
Data write
zzzz
1yyyy0
After reading UARTSR writing TDBUF
clears TBEP.
Figure 12-9 Generation of Transmit Data Buffer Empty
12.9.6 Transmit End Flag
When data are transmitted and no data is in TDBUF (UARTSR<TBEP> = “1”), transmit end flag
UARTSR<TEND> is set to “1”. The UARTSR<TEND> is cleared to “0” when the data transmit is started after
writing the TDBUF.
Shift register
TXD pin
UARTSR<TBEP>
UARTSR<TEND>
INTTXD interrupt
***^1xx
****^1x
*****¹
Stop
Data write for TDBUF
1yyyy0 *1yyyy
Start
Bit 0
Figure 12-10 Generation of Transmit End Flag and Transmit Data Buffer Empty
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