TS80C32X2 ATMEL Corporation, TS80C32X2 Datasheet - Page 19

• Manufacturer Part Number: TS80C32X2
• Description: 8-bit Microcontroller ROMless
• Manufacturer: ATMEL Corporation

A low-priority interrupt can be interrupted by a high priority interrupt, but not by another low-priority interrupt.
A high-priority interrupt can’t be interrupted by any other interrupt source.
If two interrupt requests of different priority levels are received simultaneously, the request of higher priority level
is serviced. If interrupt requests of the same priority level are received simultaneously, an internal polling sequence
determines which request is serviced. Thus within each priority level there is a second priority structure determined
by the polling sequence.
IE - Interrupt Enable Register (A8h)
Reset Value = 0XX0 0000b
Bit addressable
Rev. C - 15 January, 2001
Number
Bit
EA
7
6
5
4
3
2
1
0
7
Mnemonic
IPH.x
EX1
EX0
ET1
ET0
Bit
EA
ES
-
-
0
0
1
1
6
-
Enable All interrupt bit
enable bit.
Reserved
Reserved
Serial port Enable bit
Timer 1 overflow interrupt Enable bit
External interrupt 1 Enable bit
Timer 0 overflow interrupt Enable bit
External interrupt 0 Enable bit
Clear to disable all interrupts.
Set to enable all interrupts.
If EA=1, each interrupt source is individually enabled or disabled by setting or clearing its own interrupt
The value read from this bit is indeterminate. Do not set this bit.
The value read from this bit is indeterminate. Do not set this bit.
Clear to disable serial port interrupt.
Set to enable serial port interrupt.
Clear to disable timer 1 overflow interrupt.
Set to enable timer 1 overflow interrupt.
Clear to disable external interrupt 1.
Set to enable external interrupt 1.
Clear to disable timer 0 overflow interrupt.
Set to enable timer 0 overflow interrupt.
Clear to disable external interrupt 0.
Set to enable external interrupt 0.
5
-
Table 7. Priority Level Bit Values
Table 8. IE Register
Table 9. IP Register
ES
4
IP.x
0
1
0
1
ET1
3
Description
EX1
2
Interrupt Level Priority
TS80C31X2
3 (Highest)
ET0
0 (Lowest)
1
1
2
EX0
0
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