III PERIPHERAL BLOCK: MONITORED MOBILE ACCESS INTERFACES
(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 |
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| the second CRC byte. |
| 2. | The software has filled the transmit queue above the threshold before the interface sends |
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| 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. |
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| 1. | Rx INT and Sp INT on first receive character |
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| After the software reads the corresponding byte from the receive data register | |
| 2. | Sp INT only |
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| 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 | |
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| 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 | |
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| When the corresponding byte enters the receive queue |
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To clear | Error reset command or arrival of next frame |
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B. Interrupt source: Rx overrun error |
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Condition | Incoming data has overwritten receive queue data (Other conditions are the same as for EOF | ||
| above.) |
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To clear | Error reset command |
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C. Interrupt source: Detection of short frame |
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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 | |
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| 1. The transmit block runs out of data during or after a frame. | |
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| 2. The software issues a disable transmit command. | |
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| 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 | |
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| 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). | |
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| A "1" in this bit indicates | |
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| 1. | No synchronization |
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| 2. | Receive operation disabled |
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| 3. | Abort pattern detected |
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| A "0" in this bit indicates | |
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| 1. | Flag received in idle interval |
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| 2. | Frame being received |
| To clear | Reset E/S INT command | |
S1C33210 FUNCTION PART | EPSON |