ATA6020N ATMEL Corporation, ATA6020N Datasheet - Page 13

• Manufacturer Part Number: ATA6020N
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

4.3
4.3.1
4708D–4BMCU–09/05
Voltage Monitor
Voltage Monitor Control/Status Register
The voltage monitor consists of a comparator with internal voltage reference. It is used to super-
vise the supply voltage or an external voltage at the VMI pin. The comparator for the supply
voltage has two internal programmable thresholds: one lower threshold (4.0V) and one higher
threshold (5.0V). For external voltages at the VMI pin, the comparator threshold is set to
V
(VMS = 1) this threshold. An interrupt can be generated when the VMS-bit is set or reset to
detect a rising or falling slope. A voltage monitor interrupt (INT7) is enabled when the interrupt
mask bit (VIM) is reset in the VMC-register.
Figure 4-9.
VM2: Voltage monitor Mode bit 2
VM1: Voltage monitor Mode bit 1
VM0: Voltage monitor Mode bit 0
VMC: Write
VMST: Read
BG
= 1.25V. The VMS-bit indicates if the supervised voltage is below (VMS = 0) or above
Voltage Monitor
Bit 3
VM2
—
BP41/
VMI
VMC
VMST
Bit 2
VM1
—
VM2
IN
Voltage monitor
VM1 VM0
-
Bit 1
VM0
reserved
-
V
DD
VIM
res
OUT
VMS
Bit 0
VIM
VMS
INT7
Primary register address:
’F’hex
Reset value: 1111b
Reset value: xx11b
ATA6020N
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