
18 INTERRUPT CONTROLLER
176
EPSON
S1C38000 TECHNICAL MANUAL
bits 1–0
FIQ[1:0] Enable
These bits are used to set the FIQ[1:0] enable bits. Writing a 1 to a bit enables the fast
interrupt. Writing a 0 has no effect. When read, these bit locations provide the enable
status of the fast interrupt. A 1 indicates that the interrupt is enabled and an interrupt
request will be allowed to be sent to the processor. A 0 indicates that the interrupt is
disabled. On reset all interrupts are disabled.
bits 1–0
FIQ[1:0] Enable Clear
These bits are used to clear the FIQ[1:0] enable bits of the FIQ Enable Register,
IRQ[108h]. A 1 must be written to the FIQ enable clear bit to clear the FIQ enable bit.
Writing a 0 will have no effect.
bits 1–0
FIQ[1:0] Level
These bits are used to determine the trigger type of the FIQ[1:0] sources. A 1 written to
the level bit sets edge trigger mode. Writing a 0 to the bit sets level trigger mode.
bits 1–0
FIQ[1:0] Polarity
These bits are used to control the polarity of the FIQ[1:0] source. A 1 written to the
polarity bit sets high level trigger/positive edge trigger mode. Writing a 0 to the bit sets
low level trigger/negative edge trigger mode.
bits 1–0
FIQ[1:0] Trigger Reset
These bits are used to clear the raw status flag for edge trigger mode interrupts. A 1
written to the trigger reset bit clears the bit in the FIQ Raw Status Register, IRQ[104h].
FIQ Enable Register
IRQ[108h]
Default = 0000 0000h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
FIQ[1:0] Enable
15
14
13
12
11
10
9876543210
FIQ Enable Clear Register
IRQ[10Ch]
Write Only
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
FIQ[1:0] Enable
Clear
15
14
13
12
11
10
9876543210
FIQ Level Register
IRQ[180h]
Default = 0000 0000h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
FIQ[1:0] Level
15
14
13
12
11
10
9876543210
FIQ Polarity Register
IRQ[184h]
Default = 0000 0003h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
FIQ[1:0] Polarity
15
14
13
12
11
10
9876543210
FIQ Trigger Reset Register
IRQ[188h]
Write Only
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
FIQ[1:0] Trigger
Reset
15
14
13
12
11
10
9876543210