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9.5.4 Interrupt Handling
A supply voltage drop below the configured threshold value is indicated by an interrupt
IRQ_7 (BAT_LOW), see Section 6.6 .
Note:
1.
The
Atmel AT86RF232
IRQ_7 (BAT_LOW)
interrupt
is
issued
only
if
BATMON_OK changes from one to zero.
No interrupt is generated when:
? The battery voltage is under the default 1.8V threshold at power-on (BATMON_OK
was never one), or
? A new threshold is set, which is still above the current supply voltage (BATMON_OK
remains zero).
When the battery voltage is close to the programmed threshold voltage, noise or
temporary voltage drops may generate unwanted interrupts. To avoid this:
? Disable the IRQ_7 (BAT_LOW) in register 0x0E (IRQ_MASK) and treat the battery
as empty, or
? Set a lower threshold value.
9.5.5 Register Description
Register 0x11 (BATMON):
The BATMON register signals and configures the battery monitor to observe the supply
voltage at pin 28 (EVDD).
Figure 9-10 . Register BATMON.
Bit
7
6
5
4
0x11
reserved
BATMON_OK
BATMON_HR
BATMON
Read/Write
Reset value
Bit
0x11
Read/Write
Reset value
R
0
3
R/W
0
R/W
0
2
R/W
0
BATMON_VTH
R
0
1
R/W
1
R/W
0
0
R/W
0
BATMON
? Bit 5 - BATMON_OK
The register bit BATMON_OK indicates the level of the external supply voltage with
respect to the programmed threshold BATMON_VTH.
Table 9-9. BATMON_OK.
112
AT86RF232
Register Bits
BATMON_OK
Value
0
1
Description
The battery voltage is below the threshold
The battery voltage is above the threshold
8321A – MCU Wireless – 10/11
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