UPD78F0411GA-GAM-AX Datasheet, PDF (346/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 14 SERIAL INTERFACE UART6
(2) Asynchronous serial interface reception error status register 6 (ASIS6)
This register indicates an error status on completion of reception by serial interface UART6. It includes three
error flag bits (PE6, FE6, OVE6).
This register is read-only by an 8-bit memory manipulation instruction.
Reset signal generation, or clearing bit 7 (POWER6) or bit 5 (RXE6) of ASIM6 to 0 clears this register to 00H.
00H is read when this register is read. If a reception error occurs, read ASIS6 and then read receive buffer
register 6 (RXB6) to clear the error flag.
Figure 14-6. Format of Asynchronous Serial Interface Reception Error Status Register 6 (ASIS6)
Address: FF53H After reset: 00H R
Symbol
7
6
5
4
3
2
1
0
ASIS6
0
0
0
0
0
PE6
FE6
OVE6
PE6
Status flag indicating parity error
0
If POWER6 = 0 or RXE6 = 0, or if ASIS6 register is read
1
If the parity of transmit data does not match the parity bit on completion of reception
FE6
Status flag indicating framing error
0
If POWER6 = 0 or RXE6 = 0, or if ASIS6 register is read
1
If the stop bit is not detected on completion of reception
OVE6
0
1
Status flag indicating overrun error
If POWER6 = 0 or RXE6 = 0, or if ASIS6 register is read
If receive data is set to the RXB6 register and the next reception operation is completed before the
data is read.
Cautions 1. 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).
2. For the stop bit of the receive data, only the first stop bit is checked regardless of the number
of stop bits.
3. If an overrun error occurs, the next receive data is not written to receive buffer register 6
(RXB6) but discarded.
4. If data is read from ASIS6, a wait cycle is generated. Do not read data from ASIS6 when the
CPU is operating on the subsystem clock and the peripheral hardware clock is stopped. For
details, see CHAPTER 29 CAUTIONS FOR WAIT.
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User’s Manual U18698EJ1V0UD