Z84C90_12 Datasheet, PDF (30/56 Pages) Zilog, Inc. – KIO Serial/Parallel Counter/Timer

Z84C90 KIO Serial/Parallel Counter/Timer
Product Specification
23
D7 D6 D5 D4 D3 D2 D1 D0
000
100
100
011
011
111
111
000
Register 0
Register 1
Register 2
Register 3
Register 4
Register 5
Register 6
Register 7
1 1 1 Null code
0 0 0 Send abort (SDLC)
1 1 1 Reset Ext/Status interrupts
0 0 0 Channel reset
1 1 1 Enable interrupt on next Rx character
0 0 0 Reset TxINT pending
1 1 1 Error reset
0 0 0 Return from interrupt (Channel A only)
0 0 Null code
0 1 Reset Rx CRC checker
1 0 Reset Tx CRC generator
1 1 Reset Tx Underrun/EOM latch
Figure 22. SIO Write Register 0
D7 D6 D5 D4 D3 D2 D1 D0
Note: *Or on special condition.
External interrupt enable
Tx interrupt enable
Status affects vector (Channel B only)
0 0 Rx interrupt disable
0 1 Rx interrupt on first character
1 0 Interrupt on all Rx characters (parity affects vector)
*
1 1 Interrupt on all Rx characters (parity does not affect vector)
WAIT/READY on R/T
WAIT/READY function
WAIT/READY enable
Figure 23. SIO Write Register 1
PS011804-0612
Register Programming