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M30245 Group
UARTi transmit buffer register (i= 0 to 3) (Note)
b15
b8
(b7)
(b0)
b7
UARTi receive buffer register (i= 0 to 3)
b15
b8
(b7)
(b0)
b7
Figure 2.4.3. UARTi-related registers (1)
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Symbol
b0
U0TB
U1TB
U2TB
U3TB
Bit Symbol
(clock synchronous serial I/O mode)
Transmit data
Nothing is assigned. Write "0" when writing to these bits.
The values are indeterminate when read.
Note: Use MOV instruction to write to this register.
Symbol
b0
U0RB
U1RB
U2RB
U3RB
Bit Symbol
Nothing is assigned. Write "0" when writing to these bits.
The values are indeterminate when read.
Arbitration lost
ABT
detecting flag (Note 1)
Overrun error flag
OER
(Note 2)
Framing error flag
FER
(Note 2)
Parity error flag
PER
(Note 2)
Error sum flag
SUM
(Note 2)
Note 1: Always write "0".
Note 2: Bits 15 to 12 are set to "0000
addresses 03A8
bit is set to "0". Bit 15 is set to "0" when all of bits 14 to 12 are set to "0".
Bits 14 and 13 are also set to "0" when the lower byte of the UARTi receive buffer
register (addresses 03AE
page 60 of 354
Address
03AB
, 03AA
16
16
036B
, 036A
16
16
033B
, 033A
16
16
032B
, 032A
16
16
Function
Address
03AF
, 03AE
16
16
036F
, 036E
16
16
033F
, 033E
16
16
032F
, 032E
16
16
Function
Bit Name
(clock synchronous
serial I/O mode)
Receive data
0 : Not detected
1 : Detected
0 : No overrun error
1 : Overrun error
Invalid
Invalid
Invalid
" when the serial I/O mode select bit (bits 0 to 2 at
2
, 0368
, 0338
, 0328
16
16
16
, 036E
, 033E
16
16
When reset
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Function
(UART mode)
Transmit data
Transmit data (9th bit)
When reset
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Function
(UART mode)
Receive data
Receive data (9th bit)
Invalid
0 : No overrun error
1 : Overrun error
0 : No framing error
1 : Framing error
0 : No parity error
1 : Parity error
0 : No error
1 : Error
) are set to "000
" or the receive enable
16
2
, 032E
) is read.
16
16
2. UART
R W
R W
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