FUNCTIONAL DESCRIPTION
I N T E R R U P T E N A B L E R E G I S T E R
+-------+
D7 | 0 |
+-------+
D6 | 0 |
+-------+
D5 | 0 |
+-------+
D4 | 0 |
+-------+
D3 | EDSSI |----- MODEM status
+-------+
D2 | ELSI |----- Receiver line status
+-------+
D1 | ETBEI |----- Transmitter holding register empty
+-------+
D0 | ERBFI |----- Received data available
+-------+
EDSSI - MODEM Status Interrupt:
When set (logic 1), enables interrupts on clear
t o s e n d , d a t a s e t r e a d y , r i n g i n d i c a t o r , a n d
data carrier detect.
ELSI - Receiver Line Status Interrupt:
W h e n s e t ( l o g i c 1 ) , e n a b l e s i n t e r r u p t s o n
o v e r r u n , p a r i t y , f r a m i n g e r r o r s , a n d b r e a k
indication.
ETBEI - Transmitter Holding Register Empty Interrupt:
W h e n s e t ( l o g i c 1 ) , e n a b l e s i n t e r r u p t s o n
transmitter register empty.
ERBFI - Received Data Available Interrupt:
W h e n s e t ( l o g i c 1 ) , e n a b l e s i n t e r r u p t s o n
r e c e i v e d d a t a a v a i l a b l e o r t h e r e c e i v e r F I F O
trigger level
* .
* with optional 16550.
