MCP79411 datasheet(12/60 Pages) MICROCHIP

12 / 60 page

MCP79410/MCP79411/MCP79412

DS20002266E-page 12

 2010-2013 Microchip Technology Inc.

5.0

TIME AND DATE REGISTERS

The MCP7941X Serial Real-Time Clock/Calendar uses

a low-power external 32.768 kHz crystal to maintain the

time and date in a system.

The Real-Time Clock using an external oscillator tracks

the time and date with separate registers for hours,

minutes, seconds. The MCP7941X also has separate

calendar registers for date, month, year and day of the

week. The calendar adjusts automatically for months

with less than 31 days and also calculates the leap year

until 2099.

The Time and Date registers store the current time and

date as BCD. Using an external backup supply, the

time can be maintained during a VCC power-fail.

SECONDS 0X00

R/W-0

10 Seconds

Seconds

bit 7

bit 6

bit 4 bit 3

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 clear

“X” = Bit is unknown

bit 7

ST: Start Oscillator bit

1 = Oscillator enabled

0 = Oscillator disabled; The oscillator should be disabled before setting the Time registers.

bit 6-4

10 SECONDS <6:4>: Binary-Coded Decimal Value of Second’s Tens Digit

Contains a value from 0 to 5

bit 3-0

SECONDS<3:0>: Binary-Coded Decimal Value of Second’s Ones Digit

Contains a value from 0 to 9

MINUTES 0X01

U-0

R/W-0

—

10 Minutes

Minutes

bit 7

bit 6

bit 4 bit 3

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 clear

“X” = Bit is unknown

bit 7

Unimplemented: Read as ‘0’

bit 6-4

10 MINUTES<2:0>: Binary-Coded Decimal Value of Minute’s Tens Digit

Contains a value from 0 to 5

bit 3-0

MINUTES<3:0>: Binary-Coded Decimal Value of Minute’s Ones Digit

Contains a value from 0 to 9

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