EZ80F91MCU Datasheet, PDF (213/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
194
Bit
Position
[3:1]
INSTS
0
INTBIT
Value
000–
110
0
1
Description
Interrupt Status Code
The code indicated in these three bits is valid only if INTBIT is
1. If two internal interrupt sources are active and their
respective enable bits are High, only the higher priority
interrupt is seen by the application. The lower-priority interrupt
code is indicated only after the higher-priority interrupt is
serviced. Table 100 lists the interrupt status codes.
There is an active interrupt source within the UART.
There is not an active interrupt source within the UART.
Table 100. UART Interrupt Status Codes
INSTS
Value
011
010
110
101
001
000
Priority
Highest
Second
Third
Fourth
Fifth
Lowest
Interrupt Type
Receiver Line Status
Receive Data Ready or Trigger Level
Character Time-out
Transmission Complete
Transmit Buffer Empty
Modem Status
PS019209-0504
P R E L I M I N A R Y Universal Asynchronous Receiver/Transmitter