ATAR090-C Datasheet, PDF (13/80 Pages) ATMEL Corporation – Low-current Microcontroller for Wireless Communication

ATAR090-C/ATAR890-C
Figure 3-9. Voltage Monitor
V_DD
BP41/
VMI
Voltage monitor
OUT
IN
INT7
VMC VM2 VM1 VM0 VIM
VMST
-
- res VMS
3.4.1 Voltage Monitor Control/Status Register
VMC: Write
Bit 3
VM2
Bit 2
VM1
VMST: Read
–
–
VM2: Voltage monitor Mode bit 2
VM1: Voltage monitor Mode bit 1
VM0: Voltage monitor Mode bit 0
Bit 1
VM0
reserved
Primary register address: ’F’hex
Bit 0
VIM
Reset value: 1111b
VMS
Reset value: xx11b
Table 3-3.
VM2
1
1
1
1
0
0
0
0
Voltage Monitor Modes
VM1
1
1
0
0
1
1
0
0
VM0
1
0
1
0
1
0
1
0
Function
Disable voltage monitor
External (VIM input), internal reference threshold (1.3 V), interrupt
with negative slope
Not allowed
External (VMI input), internal reference threshold (1.3 V), interrupt
with positive slope
Internal (supply voltage), high threshold (3.0 V), interrupt with
negative slope
Internal (supply voltage), middle threshold (2.6 V), interrupt with
negative slope
Internal (supply voltage), low threshold (2.2 V), interrupt with
negative slope
Not allowed
13
4700C–4BMCU–02/05