Motorola MPC8260 User Manual
4-23
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part II. ConÞguration and Reset
Note the following:
¥
SCC/MCC/FCC SIMR bit positions are not affected by their relative priority.
¥
The user can clear pending register bits that were set by multiple interrupt events
only by clearing all unmasked events in the corresponding event register.
only by clearing all unmasked events in the corresponding event register.
¥
If an SIMR bit is masked at the same time that the corresponding SIPNR bit causes
an interrupt request to the core, the error vector is issued (if no other interrupts
pending). Thus, the user should always include an error vector routine, even if it
contains only an rÞ instruction. The error vector cannot be masked.
an interrupt request to the core, the error vector is issued (if no other interrupts
pending). Thus, the user should always include an error vector routine, even if it
contains only an rÞ instruction. The error vector cannot be masked.
4.3.1.6 SIU Interrupt Vector Register (SIVEC)
The SIU interrupt vector register (SIVEC), shown in Figure 4-18, contains an 8-bit code
representing the unmasked interrupt source of the highest priority level.
representing the unmasked interrupt source of the highest priority level.
Bits
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field FCC1 FCC2 FCC3
Ñ
MCC1 MCC2
Ñ
SCC1 SCC2 SCC3 SCC4
Ñ
Reset
0000_0000_0000_0000
R/W
R/W
Addr
Bits
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Field
I2C
SPI
RTT SMC1 SMC2 IDMA1 IDMA2 IDMA3 IDMA4 SDMA
Ñ
TIMER1 TIMER2 TIMER3 TIMER4 Ñ
Reset
0000_0000_0000_0000
R/W
R/W
Addr
0x10C22
Figure 4-17. SIMR_L Register
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field
Interrupt Code
0
0
0
0
0
0
0
0
0
0
Reset
0000_0000_0000_0000
R/W
R
Addr
Bit
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Field
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
0000_0000_0000_0000
R/W
R
Addr
0x10C06
Figure 4-18. SIU Interrupt Vector Register (SIVEC)