Interrupt system, Aduc812 – Analog Devices ADuC812 User Manual
Page 38
REV. B
ADuC812
–38–
INTERRUPT SYSTEM
The ADuC812 provides a total of nine interrupt sources with
two priority levels. The control and configuration of the interrupt
system is carried out through three Interrupt-related SFRs.
IE:
Interrupt Enable Register.
IP:
Interrupt Priority Register.
IE2:
Secondary Interrupt Enable Register.
IE:
Interrupt Enable Register
SFR Address
A8H
Power-On Default Value
00H
Bit Addressable
Yes
A
E
C
D
A
E
2
T
E
S
E
1
T
E
1
X
E
0
T
E
0
X
E
Table XXIII. IE SFR Bit Designations
Bit
Name
Description
7
EA
Written by User to Enable “1” or Disable “0” All Interrupt Sources
6
EADC
Written by User to Enable “1” or Disable “0” ADC Interrupt
5
ET2
Written by User to Enable “1” or Disable “0” Timer 2 Interrupt
4
ES
Written by User to Enable “1” or Disable “0” UART Serial Port Interrupt
3
ET1
Written by User to Enable “1” or Disable “0” Timer 1 Interrupt
2
EX1
Written by User to Enable “1” or Disable “0” External Interrupt 1
1
ET0
Written by User to Enable “1” or Disable “0” Timer 0 Interrupt
0
EX0
Written by User to Enable “1” or Disable “0” External Interrupt 0
IP:
Interrupt Priority Register
SFR Address
B8H
Power-On Default Value
00H
Bit Addressable
Yes
I
S
P
C
D
A
P
2
T
P
S
P
1
T
P
1
X
P
0
T
P
0
X
P
Table XXIV. IP SFR Bit Designations
Bit
Name
Description
7
PSI
Written by User to Select SPI/I2C Priority (“1” = High; “0” = Low)
6
PADC
Written by User to Select ADC Interrupt Priority (“1” = High; “0” = Low)
5
PT2
Written by User to Select Timer 2 Interrupt Priority (“1” = High; “0” = Low)
4
PS
Written by User to Select UART Serial Port Interrupt Priority (“1” = High; “0” = Low)
3
PT1
Written by User to Select Timer 1 Interrupt Priority (“1” = High; “0” = Low)
2
PX1
Written by User to Select External Interrupt 1 Priority (“1” = High; “0” = Low)
1
PT0
Written by User to Select Timer 0 Interrupt Priority (“1” = High; “0” = Low)
0
PX0
Written by User to Select External Interrupt 0 Priority (“1” = High; “0” = Low)