tmp89fm43l TOSHIBA Semiconductor CORPORATION, tmp89fm43l Datasheet - Page 254

• Manufacturer Part Number: tmp89fm43l
• Description: 8 Bit Microcontroller Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

16.12
Status Flag
RA001
16.12.2
RXD0 pin input
Sampling
UART0SR<FERR>
INTRXD0 interrupt request
Reading of UART0SR
Reading of RD0BUF
RD0BUF
RXD0 pin input
Sampling
UART0SR<FERR>
INTRXD0 interrupt request
Reading of UART0SR
Reading of RD0BUF
RD0BUF
of noise on the RXD0 pin, the framing error flag UART0SR<FERR> is set to "1". At this time, an INTRXD0
interrupt request is generated.
RD0BUF is read subsequently.
when RD0BUF is read subsequently. In this case, UART0SR<FERR> will be cleared to "0" when UART0SR is
read again and RD0BUF is read.
If the internal and external baud rates differ or "0" is sampled as the stop bit of received data due to the influence
If UART0SR<FERR> is "1" when UART0SR is read, UART0SR<FERR> will be cleared to "0" when
If UART0SR<FERR> is set to "1" after UART0SR is read, UART0SR<FERR> will not be cleared to "0"
Framing Error
A falling edge is
detected
A falling edge is
detected
Start Bit0
Start Bit0
Start Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Stop
Start
Figure 16-11 Occurrence of Framing Error
When the external baud rate is slower than the internally set baud rate
When the external baud rate is faster than the internally set baud rate
Bit0
Bit1
Bit1
Bit1
Bit2
Bit2
Bit2
Bit3
Bit3
Bit3
FERR is generated if “0” is received
in the sampling of the stop bit.
Bit4
Bit4
Bit4
Page 240
Bit5
Bit5
Bit5
Bit6
Bit6
Bit7 Stop
Bit7 Stop Start Bit0
Bit6
FERR is generated if “0” is received
in the sampling of the stop bit.
Indeterminate
Bit7
Stop
Indeterminate
A falling edge is
detected
Bit1
Start
Data reading
Data reading
Bit2
Bit0
FERR is cleared to “0”
when RD0BUF
is read after reading FERR=“1”.
FERR is cleared to “0”
when RD0BUF
is read after reading FERR=“1”.
Bit3
Bit1
Bit4
Bit2
Bit5
Bit3
Bit6
TMP89FM43L
Bit4
Bit7 Stop
Bit5