HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 34

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

1.7.3
The SCA flags the following transmission errors in its status registers (ST1 and ST2) to notify the
host MPU:
1. Parity error (asynchronous)
2. Framing error (asynchronous)
3. CRC error (byte synchronous or bit synchronous)
4. Overrun error (asynchronous, byte synchronous, or bit synchronous)
5. Underrun error (byte synchronous or bit synchronous)
Rev. 0, 07/98, page 18 of 453
This error occurs when the designated parity condition is not satisfied. It indicates that an
incorrect bit (possibly the parity bit) was received.
This error occurs if the RXD input is low (space) in the position of the first stop bit.
This error occurs if the correct CRC value is not obtained, indicating that a bit error occurred
on the transmission line.
This error occurs if receive data are sent to the receive FIFO when the receive FIFO is full.
After an overrun error, new receive data are overwritten on the last byte in the receive FIFO,
destroying the preceding receive data but protecting other data already received.
This error occurs if the transmit FIFO is empty after transmission of the data in the transmit
shift register.
Transmission Error Detection