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III PERIPHERAL BLOCK: MONITORED MOBILE ACCESS INTERFACES
S1C33210 FUNCTION PART EPSON B-III-10-19
(5) TXINT = HDLC transmit interrupt
Interrupt source The data in the transmit queue or transmit block satisfies the conditions below.
Condition 1. The software has not written data for the next frame by the time that the interface sends
the second CRC byte.
2. The software has filled the transmit queue above the threshold before the interface sends
the second CRC byte.
To clear Write "1" to the reset TXINT bit
(6) SPINT = HDLC Sp interrupt
A. Interrupt source: End of frame (EOF)
Condition The receive block has detected a closing flag pattern. The interrupt timing depends on the
mode.
1. Rx INT and Sp INT on first receive character
After the software reads the corresponding byte from the receive data register
2. Sp INT only
After the software reads the corresponding byte from the receive data register
3. Rx INT and Sp INT on queue threshold with a threshold setting of 0
When the corresponding byte reaches the head of the receive queue
4. Rx INT and Sp INT on queue threshold with a nonzero threshold setting
When the corresponding byte enters the receive queue
To clear Error reset command or arrival of next frame
B. Interrupt source: Rx overrun error
Condition Incoming data has overwritten receive queue data (Other conditions are the same as for EOF
above.)
To clear Error reset command
C. Interrupt source: Detection of short frame
Condition Detection of a frame with fewer than 32 bits To clear Error reset command
(7) ESINT = HDLC E/S interrupt
A. Interrupt source: Tx underrun/EOM
Condition The Tx underrun/EOM bit changes from "0" to "1." This bit goes to "1" when
1. The transmit block runs out of data during or after a frame.
2. The software issues a disable transmit command.
3. The software issues a send abort command.
To clear Reset Tx underrun/EOM command
B. Interrupt source: Abort
Condition The Abort bit changes (either direction) to indicate detection of an abort condition (seven or
more "1" bits in a row).
To clear Reset E/S INT command
C. Interrupt source: Hunt
Condition The signal latched into the Hunt bit changes (either direction).
A "1" in this bit indicates
1. No synchronization
2. Receive operation disabled
3. Abort pattern detected
A "0" in this bit indicates
1. Flag received in idle interval
2. Frame being received
To clear Reset E/S INT command