PT7C4337_13 datasheet(11/23 Pages) PERICOM

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2013-06-0002

PT0205-9

06/18/13

PT7C4337

Real-time Clock Module (I

2C Bus)



A2F

Alarm 2 Flag.

A1F

Data

Description

Read /

Write

The time do not match the alarm 2 registers.

Default

Read

Indicates that the time matched the alarm 1 registers. This flag can be used to generate an interrupt on

either INTA or SQW/INTB depending on the status of the INTCN bit. If the INTCN = 0 and A2F = 1

(and A2IE = 1), the INTA pin goes low. If the INTCN = 1 and A2F = 1 (and A2IE = 1), the

SQW/INTB pin goes low. A2F is cleared when written to logic 0. Attempting to write to logic 1 leaves

the value unchanged.

Time Counter

Time digit display (in BCD code):



Second digits: Range from 00 to 59 and carried to minute digits when incremented from 59 to 00.



Minute digits: Range from 00 to 59 and carried to hour digits when incremented from 59 to 00.



Hour digits: See description on the /12, 24 bit. Carried to day and day-of-the-week digits when incremented from 11 p.m. to

12 a.m. or 23 to 00.

Addr.

(hex)

Description

Seconds

S40

S20

S10

(default)

Undefined

Minutes

M40

M20

M10

(default)

Undefined

Hours

12, /24

H20 or P,/A

H10

(default)

Undefined

Note: Any registered imaginary time should be replaced with correct time, otherwise it will cause the clock counter malfunction.



12, /24 bit

This bit is used to select between 12-hour clock system and 24-hour clock system.

12, /24

Data

Description

Read / Write

24-hour system

12-hour system

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