ATA6612C View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
ATA6612C
Atmel Corporation
'ATA6612C' PDF : 312 Pages View PDF
5.8.7
MCU Status Register – MCUSR
The MCU status register provides information on which reset source caused an MCU reset.
Bit
7
6
5
4
3
2
1
0
–
–
–
–
WDRF BORF EXTRF PORF
Read/Write
R
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
See Bit Description
MCUSR
• Bit 7..4: Res: Reserved Bits
These bits are unused bits in the Atmel® ATA6612C/ATA6613C, and will always read as zero.
• Bit 3 – WDRF: Watchdog System Reset Flag
This bit is set if a watchdog system reset occurs. The bit is reset by a power-on reset, or by writing a logic zero to the flag.
• Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a brown-out reset occurs. The bit is reset by a power-on reset, or by writing a logic zero to the flag.
• Bit 1 – EXTRF: External Reset Flag
This bit is set if an external reset occurs. The bit is reset by a power-on reset, or by writing a logic zero to the flag.
• Bit 0 – PORF: Power-on Reset Flag
This bit is set if a power-on reset occurs. The bit is reset only by writing a logic zero to the flag.
To make use of the reset flags to identify a reset condition, the user should read and then reset the MCUSR as early as
possible in the program. If the register is cleared before another reset occurs, the source of the reset can be found by
examining the reset flags.
5.8.8 Internal Voltage Reference
Atmel ATA6612C/ATA6613C features an internal band gap reference. This reference is used for brown-out detection, and it
can be used as an input to the analog comparator or the ADC.
5.8.8.1 Voltage Reference Enable Signals and Start-up Time
The voltage reference has a start-up time that may influence the way it should be used. The start-up time is given in
Table 5-23 on page 65. To save power, the reference is not always turned on. The reference is on during the following
situations:
1. When the BOD is enabled (by programming the BODLEVEL [2..0] fuses).
2. When the bandgap reference is connected to the analog comparator (by setting the ACBG bit in ACSR).
3. When the ADC is enabled.
Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user must always allow the
reference to start up before the output from the analog comparator or ADC is used. To reduce power consumption in
power-down mode, the user can avoid the three conditions above to ensure that the reference is turned off before entering
power-down mode.
Table 5-23. Internal Voltage Reference Characteristics(1)
Parameter
Condition
Bandgap reference voltage
TBD
Bandgap reference start-up time
TBD
Bandgap reference current consumption
TBD
Note: 1. Values are guidelines only. Actual values are TBD.
Symbol
VBG
tBG
IBG
Min
Typ
Max
Units
1.0
1.1
1.2
V
40
70
µs
10
TBD
µA
ATA6612C/ATA6613C [DATASHEET]
65
9111L–AUTO–11/14
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