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Enabling Interrupts
10-5
Interrupts
10.3 Enabling Interrupts
By default, at power-up all interrupts are disabled. This means that even if, for
example, the TF0 bit is set, the MSC1210 will not execute the Timer 0 interrupt.
You must specify in code which interrupts you want the MSC1210 to enable.
You may enable and disable interrupts by modifying the IE (A8
H
), EICON
(D8
H
), and EIE (E8
H
) SFRs, as shown in Table 10−2, Table 10−3, and
Table 10−4.
Table 10−2.IE (A8
H
) SFR
Bit Name Bit Address Explanation of Function
7 EA AF
H
Global interrupt enable/disable
6 ES1 AE
H
Enable Serial Port 1 interrupt
5 ET2 AD
H
Enable Timer 2 interrupt
4 ES AC
H
Enable Serial Port 0 interrupt
3 ET1 AB
H
Enable Timer 1 interrupt
2 EX1 AA
H
Enable external interrupt 1
1 ET0 A9
H
Enable Timer 0 interrupt
0 EX0 A8
H
Enable external interrupt 0
Table 10−3.EICON (D8
H
) SFR
Bit Name Bit Address Explanation of Function
7 SMOD1 DF
H
Serial Port 1 double baud rate
6 − DE
H
Undefined (set to 1)
5 EAI DD
H
Enable auxiliary interrupt
4 AI DC
H
Auxiliary interrupt flag
3 WDTI DB
H
Watchdog interrupt flag
2 − DA
H
Undefined (cleared to 0)
1 − D9
H
Undefined (cleared to 0)
0 − D8
H
Undefined (cleared to 0)
Table 10−4.EIE (E8
H
) SFR
Bit Name Bit Address Explanation of Function
7 − EF
H
Undefined (set to 1)
6 − EE
H
Undefined (set to 1)
5 − ED
H
Undefined (set to 1)
4 EWDI EC
H
Enable Watchdog interrupt
3 EX5 EB
H
Enable external interrupt 5
2 EX4 EA
H
Enable external interrupt 4
1 EX3 E9
H
Enable external interrupt 3
0 EX2 E8
H
Enable external interrupt 2