M30218 Datasheet, PDF (90/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Serial I/O
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
UARTi transmit buffer register
(b15)
b7
(b8)
b0 b7
b0
Symbol
U0TB
U1TB
Address
03A316, 03A216
03AB16, 03AA16
When reset
Indeterminate
Indeterminate
Transmission data
Function
RW
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be indeterminate.
UARTi receive buffer register
(b15)
b7
(b8)
b0 b7
Symbol
Address
When reset
b0
U0RB 03A716, 03A616 Indeterminate
U1RB 03AF16, 03AE16 Indeterminate
Bit
symbol
Bit name
Function
(During clock synchronous
serial I/O mode)
Reception data
Function
(During UART mode)
Reception data
RW
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.
OER Overrun error flag (Note) 0 : No overrun error
1 : Overrun error found
0 : No overrun error
1 : Overrun error found
FER Framing error flag (Note) Invalid
0 : No framing error
1 : Framing error found
PER Parity error flag (Note) Invalid
0 : No parity error
1 : Parity error found
SUM Error sum flag (Note)
Invalid
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
03A016 and 03A816) are set to “0002” 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 03A616 and 03AE16) is read out.
UARTi bit rate generator
b7
b0
Symbol
U0BRG
U1BRG
Address
03A116
03A916
When reset
Indeterminate
Indeterminate
Function
Values that can be set
Assuming that set value = n, BRGi divides the count
source by (n + 1)
0016 to FF16
RW
Figure GA-3. Serial I/O-related registers (1)
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