xr82c684 Exar Corporation, xr82c684 Datasheet - Page 22

• Manufacturer Part Number: xr82c684
• Description: Cmos Quad Channel Uart Quart
• Manufacturer: Exar Corporation

Note: If this bit is configured to reflect the FFULLB
indicator, this bit will not be set (nor will produce an
interrupt request) if one or two characters are still
remaining in RHRB, following data reception. Hence, it is
possible that the last two characters in a string of data
(being received) could be lost due to this phenomenon.
ISR1[4] TXRDYB - Channel B Transmitter Ready
ISR1[3] Counter #1 Ready
ISR1[2]: Delta Break A - Channel A Change in
Break
XR82C684
Section D
Section G.2
ISR1[1] RXRDYA/FFULL A - Channel A Receiver
Ready or FIFO Full
Note: If this bit is configured to reflect the FFULLA
indicator, this bit will not be set (nor will produce an
interrupt request) if one or two characters are still
remaining in RHRA, following data reception. Hence, it is
possible that the last two characters in a string of data
(being received) could be lost due to this phenomenon.
Therefore, the user is advised to read RHRA until empty.
ISR1[0]: Channel A Transmitter Ready
C.1.2 ISR2 Register - Channels C and D
ISR2[7]: Input Port Change of State: