PIC18F87J90 Datasheet, PDF (159/450 Pages) Microchip Technology – 64/80-Pin, High-Performance Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F87J90 FAMILY
REGISTER 15-4: ALRMCFG: ALARM CONFIGURATION REGISTER
R/W-0
ALRMEN
bit 7
R/W-0
CHIME
R/W-0
AMASK3
R/W-0
AMASK2
R/W-0
AMASK1
R/W-0
AMASK0
R/W-0
ALRMPTR1
R/W-0
ALRMPTR0
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 7
bit 6
bit 5-2
bit 1-0
ALRMEN: Alarm Enable bit
1 = Alarm is enabled (cleared automatically after an alarm event whenever ARPT<7:0> = 00
and CHIME = 0)
0 = Alarm is disabled
CHIME: Chime Enable bit
1 = Chime is enabled; ALRMPTR<1:0> bits are allowed to roll over from 00h to FFh
0 = Chime is disabled; ALRMPTR<1:0> bits stop once they reach 00h
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 29^th, once every four 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 the ALRMVALH and ALRMVALL
registers. The ALRMPTR<1:0> value decrements on every read or write of ALRMVALH until it reaches
‘00’.
ALRMVALH:
00 = ALRMMIN
01 = ALRMWD
10 = ALRMMNTH
11 = Unimplemented
ALRMVALL:
00 = ALRMSEC
01 = ALRMHR
10 = ALRMDAY
11 = Unimplemented
 2010 Microchip Technology Inc.
DS39933D-page 159