Rainbow Electronics ATmega128RFA1 - Manual (Page 116)

116
8266A-MCU Wireless-12/09
ATmega128RFA1
Table 9-53 DVDD_OK Register Bits
Register Bits Value Description
0 Digital voltage regulator disabled or supply
voltage not stable DVDD_OK
1 Digital supply voltage has settled
• Bit 1:0 – DVREG_TRIM1:0 - Reserved
Table 9-54 DVREG_TRIM Register Bits
Register Bits Value Description
0 1.80V
1 1.75V
2 1.84V
DVREG_TRIM1:0
3 1.88V
9.12.21 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 RW R RW
Initial Value 0 0 0 0
Bit 3 2 1 0
NA ($151) BATMON_VTH3 BATMON_VTH2 BATMON_VTH1 BATMON_VTH0 BATMON
Read/Write RW RW RW RW
Initial Value 0 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
The register bit BATMON_OK indicates the level of the external supply voltage with
respect to the programmed threshold BATMON_VTH.
Table 9-55 BATMON_OK Register Bits
Register Bits Value Description
0 The battery voltage is below the threshold. BATMON_OK
1 The battery voltage is above the threshold.
• Bit 4 – BATMON_HR - Battery Monitor Voltage Range
This bit sets the range and resolution of the battery monitor.