APPENDIX D LIST OF CAUTIONS
User’s Manual U16899EJ2V0UD
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Chapter
Cl
assi
fi
cati
on
Function Details
of
Function
Cautions Page
The read value of the SBRT6 bit is always 0. SBRT6 is automatically cleared to 0
after SBF reception has been correctly completed.
p. 302
Before setting the SBTT6 bit to 1, make sure that bit 7 (POWER6) and bit 6
(TXE6) of ASIM6 = 1.
p. 302
The read value of the SBTT6 bit is always 0. SBTT6 is automatically cleared to 0
at the end of SBF transmission.
p. 302
Before rewriting the DIR6 and TXDLV6 bits, clear the TXE6 and RXE6 bits to 0.
p. 302
ASICL6:
Asynchronous
serial interface
control register
6
When using the 78K0/KE1+ to evaluate the program of a mask ROM version of
the 78K0/KE1, set the SBTT6, SBL62, SBL61, and SBL60 bits to 0, 1, 0, 1,
respectively.
p. 302
POWER6,
TXE6, RXE6:
Bits 7, 6, and 5
of ASIM6
Clear POWER6 to 0 after clearing TXE6 and RXE6 to 0 to set the operation stop
mode.
To start the operation, set POWER6 to 1, and then set TXE6 and RXE6 to 1.
p. 304
UART mode
Take relationship with the other party of communication when setting the port
mode register and port register.
p. 305
Parity type and
operation
Fix the PS61 and PS60 bits to 0 when the device is incorporated in LIN.
p. 309
The TXBF6 and TXSF6 flags of the ASIF6 register change from “10” to “11”, and
to “01” during continuous transmission. To check the status, therefore, do not use
a combination of the TXBF6 and TXSF6 flags for judgment. Read only the
TXBF6 flag when executing continuous transmission.
p. 311
Continuous
transmission
When the device is incorporated in a LIN, the continuous transmission function
cannot be used. Make sure that asynchronous serial interface transmission
status register 6 (ASIF6) is 00H before writing transmit data to transmit buffer
register 6 (TXB6).
p. 311
TXBF6 during
continuous
transmission:
Bit 1 of ASIF6
To transmit data continuously, write the first transmit data (first byte) to the TXB6
register. Be sure to check that the TXBF6 flag is “0”. If so, write the next transmit
data (second byte) to the TXB6 register. If data is written to the TXB6 register
while the TXBF6 flag is “1”, the transmit data cannot be guaranteed.
p. 311
To initialize the transmission unit upon completion of continuous transmission, be
sure to check that the TXSF6 flag is “0” after generation of the transmission
completion interrupt, and then execute initialization. If initialization is executed
while the TXSF6 flag is “1”, the transmit data cannot be guaranteed.
p. 311
TXSF6 during
continuous
transmission:
Bit 0 of ASIF6
During continuous transmission, an overrun error may occur, which means that
the next transmission was completed before execution of INTST6 interrupt
servicing after transmission of one data frame. An overrun error can be detected
by developing a program that can count the number of transmit data and by
referencing the TXSF6 flag.
p. 311
Be sure to read receive buffer register 6 (RXB6) even if a reception error occurs.
Otherwise, an overrun error will occur when the next data is received, and the
reception error status will persist.
p. 315
Reception is always performed with the “number of stop bits = 1”. The second
stop bit is ignored.
p. 315
Chapter 14
Soft
Serial
interface
UART6
Normal
reception
Be sure to read asynchronous serial interface reception error status register 6
(ASIS6) before reading RXB6.
p. 315
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