
128
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
Register Bits
Value
Description
1
Internal DVDD voltage regulator is disabled;
use external regulated 1.8V supply voltage
for the digital section.
Bit 2 – DVDD_OK - DVDD Supply Voltage Valid
This register bit indicates if the internal 1.8V regulated voltage supply DVDD has
settled. The bit is set to logic high if DVREG_EXT = 1.
Table 9-60 DVDD_OK Register Bits
Register Bits
Value
Description
DVDD_OK
0
Digital voltage regulator disabled or supply
voltage not stable
1
Digital supply voltage has settled
Bit 1:0 – DVREG_TRIM1:0 - Adjust DVDD Supply Voltage
These bits are reserved for internal use. They allow adjusting the value of the digital
supply voltage (DVDD).
Table 9-61 DVREG_TRIM Register Bits
Register Bits
Value
Description
DVREG_TRIM1:0
0
1.80V
1
1.75V
2
1.84V
3
1.88V
9.12.24 BATMON – Battery Monitor Control and Status Register
Bit
7
6
5
4
NA ($151)
BAT_LOW
BAT_LOW_EN
BATMON_OK
BATMON_HR
BATMON
Read/Write
RW
R
RW
Initial Value
0
Bit
3
2
1
0
NA ($151)
BATMON_VTH3
BATMON_VTH2
BATMON_VTH1
BATMON_VTH0
BATMON
Read/Write
RW
Initial Value
0
1
0
This register configures the battery monitor to observe the supply voltage at EVDD. The
status of the EVDD supply voltage is accessible by reading bit BATMON_OK with
respect to the actual BATMON settings. Furthermore the Battery Monitor Interrupt can
be controlled with the bits BAT_LOW and BAT_LOW_EN similar to the function of the
IRQ_STATUS and IRQ_MASK register for other radio transceiver interrupts.
Bit 7 – BAT_LOW - Battery Monitor Interrupt Status
A BATMON Interrupt is pending if this bit is set. Writing one to this bit if it has been at
one will clear the interrupt.
Bit 6 – BAT_LOW_EN - Battery Monitor Interrupt Enable
The Battery Monitor Interrupt is enabled if this bit is set to one. The Battery Monitor will
not generate an interrupt if this bit is zero.
Bit 5 – BATMON_OK - Battery Monitor Status