tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 226

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

16.2 Control
16. Asynchronous Serial Interface (UART)
RA001
UART0 receive data buffer
UART0 transmit data buffer
RD0BUF
(0x001E)
(0x001E)
TD0BUF
Note 1: TBFL is cleared to "0" automatically after an INTTXD0 interrupt request is generated, and is set to "1" when data is set to
Note 2: When a read instruction is executed on UART0SR, bit 4 is read as "0".
Note 3: When the STOP, IDLE0 or SLEEP0 mode is activated, each bit of UART0SR is cleared to "0" and the UART stops.
Note 1: When the STOP, IDLE0 or SLEEP0 mode is activated, the RD0BUF values become undefined. If received data is
Note 1: When the STOP, IDLE0 or SLEEP0 mode is activated, the TD0BUF values become undefined.
TD0BUF.
required, read it before activating the mode.
Read/Write
Read/Write
Bit Symbol
Bit Symbol
After reset
After reset
PERR
OERR
FERR
RBSY
TBSY
RBFL
TBFL
Parity error flag
Framing error flag
Overrun error flag
Receive busy flag
Receive buffer full flag
Transmit busy flag
Transmit buffer full flag
RD0DR7
TD0DR7
W
R
7
0
7
0
RD0DR6
TD0DR6
W
R
6
0
6
0
RD0DR5
TD0DR5
W
R
5
0
5
0
Page 212
0:
1:
0:
1:
0:
1:
0:
1:
0:
1:
0:
1:
0:
1:
No parity error
Parity error
No framing error
Framing error
No overrrun error
Overrun error
Before receiving or end of receiving
On receiving
Receive buffer empty
Receive buffer full
Before transmission or end of transmission
On transmitting
Transmit buffer empty
Transmit buffer full (Transmit data writing is completed)
RD0DR4
TD0DR4
W
R
4
0
4
0
RD0DR3
TD0DR3
W
R
3
0
3
0
RD0DR2
TD0DR2
W
R
2
0
2
0
RD0DR1
TD0DR1
W
R
1
0
1
0
TMP89FM42
RD0DR0
TD0DR0
W
R
0
0
0
0