Across
- 1. Universal Asynchronous Receiver Transmitter
- 3. Interrupt Request Register
- 5. used to demultiplex higher byte address
- 8. when no signal is requesting service
- 9. SPENAL Fully Nested Mode
- 11. Data transfer in both direction but not simultaneously
- 12. Interrupt Service Register
- 13. channel 0 has the highest priority and channel 3 has lowest priority
- 14. This is an active low input
Down
- 2. service gets lowest priority and channel next to it gets highest priority
- 4. used for extend the memory
- 6. Fully Nested Mode
- 7. Address enable
- 10. Data transfer in both direction simultaneously
- 15. End of Interrupts