UPD78F9418A NEC, UPD78F9418A Datasheet - Page 179

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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ASIS00
(3)
Notes 1. Even when the stop bit length is set to 2 bits by setting bit 2 (SL00) of asynchronous serial interface
Symbol
Asynchronous serial interface status register 00 (ASIS00)
This register indicates the type of error when a reception error occurs in the asynchronous serial interface
mode.
ASIS00 is read using a 1-bit or 8-bit memory manipulation instruction.
The contents of ASIS00 become undefined in the 3-wire serial I/O mode.
RESET input sets ASIS00 to 00H.
2. Be sure to read receive buffer register 00 (RXB00) when an overrun error occurs. If not, an overrun
OVE00
PE00
FE00
7
0
0
1
0
1
0
1
mode register 00 (ASIM00), only one stop bit is detected during reception.
error will occur every time the data is received.
Parity error did not occur
Parity error occurred (when the transmit parity and receive parity did not match)
Framing error did not occur
Framing error occurred (when stop bit was not detected)
Overrun error did not occur
Overrun error occurred
(when the next receive operation was completed before the data was read from receive buffer register 00)
Figure 13-5. Format of Asynchronous Serial Interface Status Register 00
6
0
5
0
4
0
Note 2
3
0
CHAPTER 13 SERIAL INTERFACE 00
PE00 FE00 OVE00
2
User’s Manual U13952EJ3V0UD
1
Framing error flag
Overrun error flag
0
Parity error flag
Address
FF71H
Note 1
After reset
00H
R/W
R
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