Renesas M16C Series User Manual page 99

M30240 Group
UARTi transmit buffer register
(b15) (b8)
b7 b0
UARTi receive buffer register
(b8)
(b15)
b7 b0
UARTi bit rate generator
b7
Figure 1.76: Serial I/O-related registers (1)
Rev.1.00 Sep 24, 2003 Page 81 of 360
Symbol
U0TB
b7 b0
U1TB
U2TB
Transmit data
Nothing is assigned.
These bits can neither be set nor reset. When read, their contents are indeterminate.
Symbol
b7 b0
Bit
symbol
Nothing is assigned.
These bits can neither be set nor reset. When read, the value of these bits is "0".
Overrun error flag (Note)
OER
FER Framing error flag
PER Parity error flag
SUM Error sum flag
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
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
b0
U0BRG
U1BRG
U2BRG
Assuming that set value = n, BRGi divides the count source by
n + 1
Address When reset
03A3 , 03A2 Indeterminate
16 16
03AB , 03AA Indeterminate
16 16
037B , 037A Indeterminate
16 16
Function
Address When reset
U0RB 03A7 , 03A6 Indeterminate
16 16
U1RB 03AF , 03AE Indeterminate
16 16
U2RB 037F , 037E Indeterminate
16 16
Function
Bit name
(During clock synchronous
serial I/O mode)
Receive data
0 : No overrun error
1 : Overrun error found
(Note)
Invalid
(Note)
Invalid
(Note) Invalid
) are set to "000 " or the receive enable bit is set to "0".
16 2
Address When reset
03A1 Indeterminate
16
03A9 Indeterminate
16
0379 Indeterminate
16
Function
UART0 to UART2
R W
Function
R W
(During UART mode)
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
,
16
, 03AE and 037E ) is read out.
16 16 16
Values that can be set R W
00 to FF
16 16