DS14285SSLASHTR datasheet(12/26 Pages) DALLAS

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DS14285/DS14287

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MSB

LSB

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

IRQF

IRQF - The Interrupt Request Flag (IRQF) bit is set to a 1 when one or more of the following are true:

PF = PIE = 1

AF = AIE = 1

UF = UIE = 1

That is, IRQF = PF

• PIE + AF • AIE + UF • UIE.

Any time the IRQF bit is a 1, the IRQ pin is driven low. All flag bits are cleared after Register C is read

by the program or when the RESET pin is low.

PF - The Periodic Interrupt Flag (PF) is a read-only bit which is set to a 1 when an edge is detected on the

selected tap of the divider chain. The RS3 through RS0 bits establish the periodic rate. PF is set to a 1

independent of the state of the PIE bit. When both PF and PIE are 1s, the IRQ signal is active and will set

the IRQF bit. The PF bit is cleared by a RESET or a software read of Register C.

AF - A 1 in the Alarm Interrupt Flag (AF) bit indicates that the current time has matched the alarm time.

If the AIE bit is also a 1, the IRQ pin will go low and a one will appear in the IRQF bit. A RESET or a

read of Register C will clear AF.

UF - The Update Ended Interrupt Flag (UF) bit is set after each update cycle. When the UIE bit is set to

1, the 1 in UF causes the IRQF bit to be a 1 which will assert the IRQ pin. UF is cleared by reading

BIT 0 THROUGH BIT 3 - These are unused bits of the status Register C. These bits always read 0 and

cannot be written.

MSB

LSB

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

VRT

VRT - The Valid RAM and Time (VRT) bit indicates the condition of the internal battery (the battery

connected to the VBAT pin in the case of the DS14285S, DS14285, and the DS14285Q). This bit is not

writable and should always be a 1 when read. If a 0 is ever present, an exhausted internal lithium energy

source is indicated and both the contents of the RTC data and RAM data are questionable. This bit is

unaffected by RESET .

BIT 6 THROUGH BIT 0 - The remaining bits of Register D are not usable. They cannot be written and,

when read, they will always read 0.

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