MCP795W21 datasheet(13/54 Pages) MICROCHIP

13 / 54 page

 2011-2012 Microchip Technology Inc.

Preliminary

DS22280C-page 13

MCP795W1X/MCP795W2X

HOUR 0X03

R/W

CALSGN

12/24

10 Hour

AM/PM

10 Hour

Hour

bit 7

bit 6

bit 5

bit 4

bit 3

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

bit 7

CALSGN: Calibration Sign bit

Bit 7 is the sign bit (CALSGN) for the calibration. Clearing this bit produces a positive calibration,

setting this bit produces a negative calibration.

bit 6

12/24: Clearing this bit to ‘0’ enables 24-hour format, setting this bit to ‘1’ enables 12-hour format.

bit 5

10 HOUR: AM/PM bit for 12-hour time

bit 4

10 HOUR

bit 3-0

HOUR<3:0>

Note 1:

Contains the BCD hour in bits <3:0>. Bits <5:4> contain either the 10-hour in BCD for 24-hour format or

the AM/PM indicator and the 10-hour bit for 12-hour format. Bit 5 determines the hour format.

DAY 0X04

U-0

R/W

—

OSCON

VBAT

VBATEN

Day

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

bit 7-6

Unimplemented: Read as ‘0’

bit 5

OSCON: Oscillator On bit

This bit is set and cleared by hardware. If this bit is set, the oscillator is running; if

clear, the oscillator is not running. This bit does not indicate that the oscillator is running at the correct

frequency. The bit will wait 32 oscillator cycles before the bit is set.

bit 4

VBAT: External Battery Switched Flag bit

This bit is set by hardware when the VCC fails and the VBAT is used to power the oscillator and the

RTCC registers. This bit is cleared by software.

bit 3

VBATEN: External Battery Enable bit

If this bit is set the internal circuitry is connected to the VBAT pin. If this bit is ‘0’ then the VBAT pin is

disconnected and the only current drain on the external battery is the VBAT pin leakage.

bit 2-0

DAY<2:0>

Note 1:

Contains the BCD day. The range is 1-7. Also, additional bits are used for configuration and status.

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