UART0 to UART2
M30240 Group
Rev.1.00 Sep 24, 2003 Page 81 of 360
Figure 1.76: Serial I/O-related registers (1)
b7
UARTi bit rate generator
b0
Symbol Address When reset
U0BRG 03A1
16
Indeterminate
U1BRG 03A9
16
Indeterminate
U2BRG 0379
16
Indeterminate
Function
Assuming that set value = n, BRGi divides the count source by
n + 1
00
16
to FF
16
Values that can be set
WR
b7 b0
(b15) (b8)
b7 b0
UARTi transmit buffer register
Function
Transmit data
Nothing is assigned.
These bits can neither be set nor reset. When read, their contents are indeterminate.
Symbol Address When reset
U0TB 03A3
16
, 03A2
16
Indeterminate
U1TB 03AB
16
, 03AA
16
Indeterminate
U2TB 037B
16
, 037A
16
Indeterminate
WR
(b15)
Symbol Address When reset
U0RB 03A7
16
, 03A6
16
Indeterminate
U1RB 03AF
16
, 03AE
16
Indeterminate
U2RB 037F
16
, 037E
16
Indeterminate
b7 b0
(b8)
b7 b0
UARTi receive buffer register
Function
(During UART mode)
Function
(During clock synchronous
serial I/O mode)
Bit name
Bit
symbol
0 : No framing error
1 : Framing error found
0 : No parity error
1 : Parity error found
0 : No error
1 : Error found
Note : Bits 15 through 12 are set to “0” when the serial I/O mode select bit (bits 2 to 0 at addresses 03A0
16
,
03A8
16
and 0378
16
) are set to “000
2
” or the receive enable bit is set to “0”.
(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
16
, 03AE
16
and 037E
16
) is read out.
Invalid
Invalid
Invalid
OER
FER
PER
SUM
Overrun error flag (Note)
Framing error flag
Parity error flag
Error sum flag
0 : No overrun error
1 : Overrun error found
0 : No overrun error
1 : Overrun error found
Nothing is assigned.
These bits can neither be set nor reset. When read, the value of these bits is “0”.
WR
Receive data
Receive data
(Note)
(Note)
(Note)
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