Renesas M16C Series User Manual page 199

M30240 Group
UARTi transmit buffer register
(b15) (b8)
b7 b0 b7
UARTi receive buffer register
(b8)
(b15)
b7 b0 b7
UARTi bit rate generator
b7 b0
Figure 2.40: Serial I/O related register (1)
Rev.1.00 Sep 24, 2003 Page 181 of 360
Symbol Address
U0TB 03A3 , 03A2
b0
16
U1TB 03AB , 03AA
16
U2TB 037B , 037A
16
Transmit data
Nothing is assigned.
In an attempt to write to these bits, write "0". The values are indeterminate when read.
Symbol Address
b0
U0RB 03A7 , 03A6
16
U1RB 03AF , 03AE
16
U2RB 037F , 037E
16
Bit
Bit name
(During clock synchronous
symbol
Nothing is assigned.
These bits cannot be set or reset. When read, the value of these bits is "0".
Overrun error flag (Note) 0 : No overrun error
OER
1 : Overrun error found
(Note)
FER Framing error flag Invalid
(Note)
PER Parity error flag Invalid
SUM Error sum flag (Note) Invalid
Note : Bits 15 through 12 are set to "0" when the serial I/O mode select bit (bits 2 to 0 at addresses 03A0
03A8 and 0378 ) are set to "000
16 16
(Bit 15 is set to "0" when bits 14 to 12 all are set to "0".) Bits 14 and 13 are also set to "0" when the
lower byte of the UARTi receive buffer register (addresses 03A6
Symbol Address
U0BRG 03A1
16
U1BRG 03A9
16
U2BRG 0379
16
Function
Assuming that set value = n, BRGi divides the count source by
n + 1
Clock-Synchronous Serial I/O
When reset
Indeterminate
16
Indeterminate
16
Indeterminate
16
Function
When reset
Indeterminate
16
Indeterminate
16
Indeterminate
16
Function
Function
(During UART mode)
serial I/O mode)
Receive data
Receive data
0 : No overrun error
1 : Overrun error found
0 : No framing error
1 : Framing error found
0 : No parity error
1 : Parity error found
0 : No error
1 : Error found
" or the receive enable bit is set to "0".
2
, 03AE
16 16
When reset
Indeterminate
Indeterminate
Indeterminate
Values that can be set
00
16
R W
R W
,
16
and 037E ) is read out.
16
R W
to FF
16