64GA106 datasheet(213/330 Pages) MICROCHIP

213 / 330 page

 2010 Microchip Technology Inc.

DS39905E-page 213

PIC24FJ256GA110 FAMILY

19.1.3

RTCC CONTROL REGISTERS

RCFGCAL: RTCC CALIBRATION AND CONFIGURATION REGISTER(1)

R/W-x

U-x

R/W-x

R-x

R/W-x

RTCEN(2)

—

RTCWREN

RTCSYNC

HALFSEC(3)

RTCOE

RTCPTR1

RTCPTR0

bit 15

bit 8

R/W-x

CAL7

CAL6

CAL5

CAL4

CAL3

CAL2

CAL1

CAL0

bit 7

bit 0

Legend:

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 15

RTCEN:

RTCC Enable bit(2)

= RTCC module is enabled

= RTCC module is disabled

bit 14

Unimplemented:

Read as ‘0’

bit 13

RTCWREN:

RTCC Value Registers Write Enable bit

= RTCVALH and RTCVALL registers can be written to by the user

= RTCVALH and RTCVALL registers are locked out from being written to by the user

bit 12

RTCSYNC:

RTCC Value Registers Read Synchronization bit

= RTCVALH, RTCVALL and ALCFGRPT registers can change while reading due to a rollover ripple

resulting in an invalid data read. If the register is read twice and results in the same data, the data

can be assumed to be valid.

= RTCVALH, RTCVALL or ALCFGRPT registers can be read without concern over a rollover ripple

bit 11

HALFSEC:

Half-Second Status bit(3)

= Second half period of a second

= First half period of a second

bit 10

RTCOE:

RTCC Output Enable bit

= RTCC output enabled

= RTCC output disabled

bit 9-8

RTCPTR<1:0>:

RTCC Value Register Window Pointer bits

Points to the corresponding RTCC Value registers when reading the RTCVALH and RTCVALL registers;

the RTCPTR<1:0> value decrements on every read or write of RTCVALH until it reaches ‘00’.

RTCVAL<15:8>:

= MINUTES

= WEEKDAY

=MONTH

=Reserved

RTCVAL<7:0>:

= SECONDS

= HOURS

= DAY

= YEAR

Note 1:

The RCFGCAL register is only affected by a POR.

A write to the RTCEN bit is only allowed when RTCWREN = 1.

This bit is read-only; it is cleared to ‘0’ on a write to the lower half of the MINSEC register.

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