Microchip Technology ARD00385 Data Sheet
2009-2011 Microchip Technology Inc.
DS39957D-page 221
PIC18F87K90 FAMILY
REGISTER 17-4:
ALRMCFG: ALARM CONFIGURATION REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ALRMEN
CHIME
AMASK3
AMASK2
AMASK1
AMASK0
ALRMPTR1 ALRMPTR0
bit 7
bit 0
Legend:
R = Readable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
ALRMEN:
Alarm Enable bit
1
= Alarm is enabled (cleared automatically after an alarm event whenever ALRMPTR<1:0> = 00
and CHIME = 0)
0
= Alarm is disabled
bit 6
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
bit 5-2
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
bit 1-0
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
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
00
= ALRMSEC
01
= ALRMHR
10
= ALRMDAY
11
= Unimplemented