M16C6K9 Datasheet, PDF (101/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Serial I/O
UARTi transmit buffer register
(b15)
b7
(b8)
b0 b7
Symbol
b0
U0TB
U1TB
U2TB
Address
03A316, 03A216
03AB16, 03AA16
037B16, 037A16
When reset
Indeterminate
Indeterminate
Indeterminate
Transmit data
Function
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turn out to be indeterminate.
RW
UARTi receive buffer register
(b15)
b7
(b8)
b0 b7
Symbol
Address
When reset
b0
U0RB 03A716, 03A616 Indeterminate
U1RB 03AF16, 03AE16 Indeterminate
U2RB 037F16, 037E16 Indeterminate
Bit
symbol
Bit name
Function
(During clock synchronous
serial I/O mode)
Receive data
Function
(During UART mode)
Receive data
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 1) ^{0 : No overrun error}
1 : Overrun error found
0 : No overrun error
1 : Overrun error found
FER Framing error flag (Note 1) Invalid
PER Parity error flag (Note 1) Invalid
SUM Error sum flag (Note 1) Invalid
0 : No framing error
1 : Framing error found
0 : No parity error
1 : Parity error found
0 : No error
1 : Error found
RW
Note 1: Bits 15 through 12 are set to “0” when the serial I/O mode selection bits (bits 2 to 0 at addresses
03A016, 03A816 and 037816) 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, 03AE16 and 037E16) is read out.
UARTi bit rate generator
b7
b0
Symbol
U0BRG
U1BRG
U2BRG
Address
03A116
03A916
037916
Function
When reset
Indeterminate
Indeterminate
Indeterminate
Assuming that set value = n, BRGi divides the count source by
n+1
Values that can be set
0016 to FF16
RW
Fig.GA-4 Serial I/O-related registers (1)
Rev.1.00 Jun 06, 2003 page 101 of 290