PIC24FJ16MC101_12 Datasheet, PDF (224/350 Pages) Microchip Technology – 16-bit Microcontrollers (up to 32 KB Flash and 2 KB SRAM)

PIC24FJ16MC101/102 AND PIC24FJ32MC101/102/104
REGISTER 21-3: ALCFGRPT: ALARM CONFIGURATION REGISTER
R/W-0
ALRMEN
bit 15
R/W-0
CHIME
R/W-0
R/W-0
R/W-0
AMASK<3:0>
R/W-0
R/W-0
R/W-0
ALRMPTR<1:0>
bit 8
R/W-0
bit 7
R/W-0
R/W-0
R/W-0
R/W-0
ARPT<7:0>
R/W-0
R/W-0
R/W-0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
bit 14
bit 13-10
bit 9-8
bit 7-0
ALRMEN: Alarm Enable bit
1 = Alarm is enabled (cleared automatically after an alarm event whenever ARPT<7:0> = 0x00 and
CHIME = 0)
0 = Alarm is disabled
CHIME: Chime Enable bit
1 = Chime is enabled; ARPT<7:0> bits are allowed to roll over from 0x00 to 0xFF
0 = Chime is disabled; ARPT<7:0> bits stop once they reach 0x00
AMASK<3:0>: Alarm Mask Configuration bits
0000 = Every half second
0001 = Every second
0010 = Every 10 seconds
0011 = Every minute
0100 = Every 10 minutes
0101 = Every hour
0110 = Once a day
0111 = Once a week
1000 = Once a month
1001 = Once a year (except when configured for February 29th, once every 4 years)
101x = Reserved – do not use
11xx = Reserved – do not use
ALRMPTR<1:0>: Alarm Value Register Window Pointer bits
Points to the corresponding Alarm Value registers when reading ALRMVALH and ALRMVALL registers;
the ALRMPTR<1:0> value decrements on every read or write of ALRMVALH until it reaches ‘00’.
ALRMVAL<15:8>:
00 = ALRMMIN
01 = ALRMWD
10 = ALRMMNTH
11 = Unimplemented
ALRMVAL<7:0>:
00 = ALRMSEC
01 = ALRMHR
10 = ALRMDAY
11 = Unimplemented
ARPT<7:0>: Alarm Repeat Counter Value bits
11111111 = Alarm will repeat 255 more times
•
•
•
00000000 = Alarm will not repeat
The counter decrements on any alarm event. The counter is prevented from rolling over from 0x00 to
0xFF unless CHIME = 1.
DS39997C-page 224
Preliminary
© 2011-2012 Microchip Technology Inc.