M16C Datasheet, PDF (115/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Serial I/O
UARTi transmit buffer register
(b15)
b7
(b8)
b0 b7
UARTi receive buffer register
(b15)
b7
(b8)
b0 b7
UARTi bit rate generator
b7
b0
Symbol
b0
U0TB
U1TB
U2TB
Address
03A316, 03A216
03AB16, 03AA16
01FB16, 01FA16
When reset
Indeterminate
Indeterminate
Indeterminate
Transmit data (Note)
Function
Nothing is assigned.
These bits can neither be set nor reset. When read, their contents are indeterminate.
Note: Bit 8 is set to “1” when I²C mode is used.
RW
Symbol
Address
When reset
b0
U0RB 03A716, 03A616 Indeterminate
U1RB 03AF16, 03AE16 Indeterminate
U2RB 01FF16, 01FE16 Indeterminate
Bit
symbol
Bit name
Function
(During clock synchronous
serial I/O mode)
Receive data
Function
(During UART mode)
Receive data
RW
Nothing is assigned.
These bits can neither be set nor reset. When read, the value of these bits is “0”.
ABT
OER
Arbitration lost detecting
flag (Note 2)
0 : Not detected
1 : Detected
Overrun error flag (Note 1) 0 : No overrun error
1 : Overrun error found
Invalid
0 : No overrun error
1 : Overrun error found
FER Framing error flag (Note 1) Invalid
0 : No framing error
1 : Framing error found
PER Parity error flag (Note 1) Invalid
0 : No parity error
1 : Parity error found
SUM Error sum flag (Note 1) Invalid
0 : No error
1 : Error found
Note 1: Bits 15 through 12 are set to “0” when the serial I/O mode select bit (bits 2 to 0 at addresses 03A016,
03A816 and 01F816) 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 01FE16) is read out.
Note 2: Arbitration lost detecting flag is allocated to U2RB and noting but “0” may be written. Nothing is
assigned in bit 11 of U0RB and U1RB. These bits can neither be set or reset. When read, the value
of this bit is “0”.
Symbol
U0BRG
U1BRG
U2BRG
Address
03A116
03A916
01F916
When reset
Indeterminate
Indeterminate
Indeterminate
Function
Assuming that set value = n, BRGi divides the count source by
n+1
Values that can be set
0016 to FF16
RW
Figure 12-4. Serial I/O-related registers (1)
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