Microchip Technology MA180025 データシート
PIC18F87J90 FAMILY
DS39933D-page 160
2010 Microchip Technology Inc.
15.1.2
RTCVALH AND RTCVALL
REGISTER MAPPINGS
REGISTER MAPPINGS
REGISTER 15-5:
ALRMRPT: ALARM REPEAT 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
ARPT7
ARPT6
ARPT5
ARPT4
ARPT3
ARPT2
ARPT1
ARPT0
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 7-0
ARPT<7:0>: Alarm Repeat Counter Value bits
11111111
= Alarm will repeat 255 more times
.
.
.
00000000
.
.
00000000
= Alarm will not repeat
The counter decrements on any alarm event. The counter is prevented from rolling over from 00h to
FFh unless CHIME = 1.
FFh unless CHIME = 1.
REGISTER 15-6:
RESERVED REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
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 7-0
Unimplemented: Read as ‘0’
REGISTER 15-7:
YEAR: YEAR VALUE REGISTER
(1)
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
YRTEN3
YRTEN2
YRTEN1
YRTEN0
YRONE3
YRONE2
YRONE1
YRONE0
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 7-4
YRTEN<3:0>: Binary Coded Decimal Value of Year’s Tens Digit bits
Contains a value from 0 to 9.
Contains a value from 0 to 9.
bit 3-0
YRONE<3:0>: Binary Coded Decimal Value of Year’s Ones Digit bits
Contains a value from 0 to 9.
Contains a value from 0 to 9.
Note 1:
A write to the YEAR register is only allowed when RTCWREN = 1.