M16C1N Datasheet, PDF (122/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
13. Serial I/O
UARTi transmit buffer register
(b15)
b7
(b8)
b0 b7
b0
Symbol
U0TB
U1TB
Address
00A316, 00A216
00AB16, 00AA16
When reset
Indeterminate
Indeterminate
Function
RW
Transmit data (Note 1)
WO
Nothing is assigned.
In an attempt to write to these bits, write "0". The value, if read, turns out to be
indeterminate.
Note 1: When transfer data length is 9-bit long, write high-byte first then low-byte with byte-size.
UARTi receive buffer register
(b15)
b7
(b8)
b0 b7
b0
Symbol
U0RB
U1RB
Address
00A716, 00A616
00AF16, 00AE16
When reset
Indeterminate
Indeterminate
Bit
symbol
Bit name
Function
Function
(During clock synchronous serial I/O mode) (During UART mode)
RW
Receive data
Receive data
RO
Nothing is assigned.
In an attempt to write to these bits, write "0". The value, if read, turns out to be
indeterminate.
OER
Overrun error flag
(Note 1)
0 : No overrun error
0 : No overrun error
1 : Overrun error found 1 : Overrun error found
RO
FER Framing error flag Invalid
(Note 1)
0 : No framing error
1 : Framing error found ^RO
PER Parity error flag
(Note 1)
Invalid
0 : No parity error
1 : Parity error found
RO
SUM Error sum flag
(Note 1)
Invalid
0 : No error
1 : Error found
RO
Note 1: Bits 15 to 12 are set to "0" when the serial I/O mode select bits (bit 2 to 0 at addresses 00A016 and 00A816) are set to "0002" or
receive enable bit 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 00A616, and 00AE16) is read out or when this register is read out in word-size.
When reading data from the UARTi receive buffer, data should be read high-byte first then low-byte using byte-size.
UARTi bit rate generator
b7
b0
Symbol
U0BRG
U1BRG
Address
00A116
00A916
Function
Assuming that set value = n, BRGi divides the
count source by n + 1
When reset
Indeterminate
Indeterminate
Values that can be set RW
0016 to FF16
WO
Figure 13.3 Serial I/O-related registers (1)
Rev.1.00 Oct 20, 2004 page 110 of 222
REJ09B0007-0100Z