Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
35
Bit name
Function
bit0 TBI:
Transmission bus idle flag
bit
"0" Read: Transmission is in progress
"1" Read: No transmission is in progress
⋅
This bit indicates that UART has no transmission in progress.
⋅
When transmission data has been written to the transmit data register
(TDR), this bit will become "0".
⋅
When the transmit data register is empty (TDRE=1) and no transmission
is in progress, this bit will be set to "1".
⋅
When you set "1" to the UPCL bit of the serial control register (SCR),
the TBI bit will be set to "1".
⋅
When this bit is "1" and transmission bus idle interrupts are enabled
(SCR:TBIE=1), a transmission interrupt request will be output.
MB91520 Series
MN705-00010-1v0-E
1348