AFE8221 Datasheet, PDF (33/48 Pages) Texas Instruments – Dual IF Analog Front-End for Digital Radio

AFE8221
www.ti.com
The behavior of the IRQ0 pin is determined by
irq0_sense. When irq0_sense is '0', IRQ0 is normally
low and goes high on an unmasked interrupt event.
When irq0_sense is '1', IRQ0 is normally high and
goes low on an unmasked interrupt event. Table 24
shows the irq0, irq1, and irq2 operations control
settings.
Table 24. IRQ Control Register Settings
PARAMETER
irq0_en
irq1_en
irq2_en
irq0_gpio_edge
irq1_gpio_edge
irq2_gpio_edge
irq0_gpio_en
irq1_gpio_en
irq2_gpio_en
irq0_gpio_status
irq1_gpio_status
irq2_gpio_status
irq0_sense
irq1_sense
irq2_sense
irq0_status
irq1_status
irq2_status
ADDRESS
50
55
60
48
53
58
49
54
59
52
57
62
2
2
2
51
56
61
BITS
15:0
15:0
15:0
11:0
11:0
11:0
11:0
11:0
11:0
11:0
11:0
11:0
1
2
3
15:0
15:0
15:0
WAKEUP INTERRUPT GENERATOR
The WAKEUP interrupt generator functions in the
same way as the IRQ generators with the following
exceptions:
1. The WAKEUP generator runs on the RTC clock
instead of MCLK;
SBAS394A – APRIL 2007 – REVISED MARCH 2008
2. The WAKEUP generator operates when the AFE
is in low-power mode, whereas the IRQ
generators do not; and
3. The interrupt sources for the WAKEUP interrupt
generator are slightly different.
Table 25 shows the wakeup control settings.
Table 26 shows the generator functions.
Table 25. Wakeup Control Register Settings
PARAMETER
wakeup_sense
wakeup_gpio_edge
wakeup_gpio_en
wakeup_en
wakeup_status
wakeup_gpio_status
ADDRESS
2
80
81
82
83
84
BITS
0
11:0
11:0
15:0
15:0
11:0
Table 26. WAKEUP Interrupt Generator
BIT POSITION
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SOURCE
GPIO
None
None
None
None
None
None
None
RTC alarm
RTC seconds rollover
RTC minutes rollover
RTC hours rollover
RTC months rollover
RTC day rollover
RTC year rollover
Copyright © 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): AFE8221
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