APPENDIX D LIST OF CAUTIONS
User’s Manual U17446EJ3V1UD
393
(11/19)
Chapter
Cl
assi
fi
cati
on
Function
Details of
Function
Cautions Page
RXB6: Receive
buffer register 6
Reception enable status is entered, after having set RXE6 to 1 and one clock
of the base clock (f
XCLK6
) has elapsed.
p.185
When starting transmission, write transmit data to TXB6, after having set TXE6
to 1 and a wait of one clock or more of the base clock (f
XCLK6
) has been
performed.
p.185
Do not write data to TXB6 when bit 1 (TXBF6) of asynchronous serial interface
transmission status register 6 (ASIF6) is 1.
p.185
TXB6: Transmit
buffer register 6
Do not refresh (write the same value to) TXB6 by software during a
communication operation (when bit 7 (POWER6) and bit 6 (TXE6) of
asynchronous serial interface operation mode register 6 (ASIM6) are 1 or
when bit 7 (POWER6) and bit 5 (RXE6) of ASIM6 are 1). When outputting
same values in continuous transmission, be sure to confirm that TXBF6 is 0
before writing the same values to TXB6.
p.185
At startup, transmission operation is started by setting TXE6 to 1 after having
set POWER6 to 1, then setting the transmit data to TXB6 after having waited
for one clock or more of the base clock (f
XCLK6
). When stopping transmission
operation, set POWER6 to 0 after having set TXE6 to 0.
p.187
At startup, reception enable status is entered after having set POWER6 to 1,
then setting RXE6 to 1, and one clock of the base clock (f
XCLK6
) has elapsed.
When stopping reception operation, set POWER6 to 0 after having set RXE6
to 0.
p.188
Set POWER6 = 1
→
RXE6 = 1 in a state where a high level has been input to
the RxD6 pin. If POWER6 = 1
→
RXE6 = 1 is set during low-level input,
reception is started and correct data will not be received.
p.188
Clear the TXE6 and RXE6 bits to 0 before rewriting the PS61, PS60, and CL6
bits.
p.188
Fix the PS61 and PS60 bits to 0 when the interface is used in LIN
communication operation.
p.188
Make sure that TXE6 = 0 when rewriting the SL6 bit. Reception is always
performed with “the number of stop bits = 1”, and therefore, is not affected by
the set value of the SL6 bit.
p.188
ASIM6:
Asynchronous
serial interface
operation mode
register 6
Make sure that RXE6 = 0 when rewriting the ISRM6 bit.
p.188
The operation of the PE6 bit differs depending on the set values of the PS61
and PS60 bits of asynchronous serial interface operation mode register 6
(ASIM6).
p.188
The first bit of the receive data is checked as the stop bit, regardless of the
number of stop bits.
p.188
If an overrun error occurs, the next receive data is not written to receive buffer
register 6 (RXB6) but discarded.
p.188
pp.
Chapter 1
1
Soft
Serial
interface
UART6
ASIS6:
Asynchronous
serial interface
reception error
status register 6
Be sure to read ASIS6 before reading receive buffer register 6 (RXB6).
188, 206