PT7C4302WEX Datasheet PT7C4302WEX, PT7C4302WE | P7-P9

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2015-11-0004 PT0225-6 11/25/15

7

PT7C4302

Real-time Clock Module (3-wire Interface)

Registers

1. Allocation of registers

Addr.

(hex)

*1

Function

Register definition

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00

Seconds (00-59)

/EOSC

*2

S40

S20

S10

S8

S4

S2

S1

01

Minutes (00-59)

0

M40

M20

M10

M8

M4

M2

M1

02

Hours (00-23 / 01-12)

12, /24

0

H20 or

P /A

H10

H8

H4

H2

H1

03

Dates (01-31)

0

D20

D10

D8

D4

D2

D1

04

Months (01-12)

0

MO10

MO8

MO4

MO2

MO1

05

Days of the week (01-07)

0

W4

W2

W1

06

Years (00-99)

Y80

Y40

Y20

Y10

Y8

Y4

Y2

Y1

07

Control

WP

*3

0

08

Trickle charger

TCS

*4

TCS

DS

*5

DS

RS

*6

RS

1F

Clock burst

*7

-

20~3E

RAM

*9

-

3F

RAM burst

*8

-

Caution points:

*1. PT7C4302 uses 5 bits for address. It’s address byte consists of 1 + RAM/Clock select bit +5-bit addr. + Read/Write select bit.

*2. Oscillator Enable bit. When this bit is set to 1, oscillator is stopped but time count chain is still active.

*3. WP: Write Protect bit. WP bit should be cleared before attempting to write to the device.

*4. TCS: Trickle Charger Select.

*5. DS: Diode Select.

*6. RS: Resistor Select.

*7. Clock burst register address is used as clock/calendar burst mode operation address for consecutively read/write 0~7H

registers. Clock/calendar burst mode operation can continuously read 0H to maximum 7H registers in order; write 0~7H registers

in order. Less or larger than 8 bytes in clock burst write mode are ignored.

*8. RAM burst register address is used as RAM burst mode operation address for consecutively read/write 20~3EH RAM. Less

than 31 bytes in RAM burst read/write mode are valid.

*9. PT7C4302 has 318 static RAM for customer use. It is volatile RAM.

*10. All bits marked with "0" are read-only bits. Their value when read is always "0". All bits marked with "-" are customer

using space.

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2015-11-0004 PT0225-6 11/25/15

8

PT7C4302

Real-time Clock Module (3-wire Interface)

2. Control and status register

Addr.

(hex)

Description

D7

D6

D5

D4

D3

D2

D1

D0

07

Control

WP

0

(default)

0

WP: Write Protect bit.

WP

Data

Description

Read / Write

0

Write operation is enabled.

Default

1

Prevent a write operation to any other register.

3. 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

D7

D6

D5

D4

D3

D2

D1

D0

00

Seconds

/EOSC

*

S40

S20

S10

S8

S4

S2

S1

(default)

0

Undefined

01

Minutes

0

M40

M20

M10

M8

M4

M2

M1

(default)

0

Undefined

02

Hours

12, /24

0

H20 or P,/A

H10

H8

H4

H2

H1

(default)

Undefined

0

Undefined

* Note: /EOSC bit must be written into 0 to start the time count.

a) 12 / 24 bit

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

12, /24

Description

Hours register

0

24-hour time display

1

12-hour time display

Be sure to select between 12-hour and 24-hour clock operation before writing the time data.

24-hour clock

12-hour clock

24-hour clock

12-hour clock

00

92 ( AM 12)

12

B2 ( PM 12 )

01

81 ( AM 01 )

13

A1 ( PM 01 )

02

82 ( AM 02 )

14

A2 ( PM 02 )

03

83 ( AM 03 )

15

A3 ( PM 03 )

04

84 ( AM 04 )

16

A4 ( PM 04 )

05

85 ( AM 05 )

17

A5 ( PM 05 )

06

86 ( AM 06 )

18

A6 ( PM 06 )

07

87 ( AM 07 )

19

A7 ( PM 07 )

08

88 ( AM 08 )

20

A8 ( PM 08 )

09

89 ( AM 09 )

21

A9 ( PM 09 )

10

90 ( AM 10 )

22

B0 ( PM 10 )

11

91 ( AM 11 )

23

B1 ( PM 11 )

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2015-11-0004 PT0225-6 11/25/15

9

PT7C4302

Real-time Clock Module (3-wire Interface)

4. Days of the week Counter

The day counter is a divide-by-7 counter that counts from 01 to 07 and up 07 before starting again from 01. Values that

correspond to the day of week are user defined but must be sequential (i.e., if 1 equals Sunday, then 2 equals Monday, and so on).

Illogical time and date entries result in undefined operation.

Addr.

(hex)

Description

D7

D6

D5

D4

D3

D2

D1

D0

05

Days of the week

0

W4

W2

W1

(default)

0

Undefined

5. Calendar Counter

The data format is BCD format.

 Day digits: Range from 1 to 31 (for January, March, May, July, August, October and December).

Range from 1 to 30 (for April, June, September and November).

Range from 1 to 29 (for February in leap years).

Range from 1 to 28 (for February in ordinary years).

Carried to month digits when cycled to 1.

 Month digits: Range from 1 to 12 and carried to year digits when cycled to 1.

 Year digits: Range from 00 to 99 and 00, 04, 08, …, 92 and 96 are counted as leap years.

Addr.

(hex)

Description

D7

D6

D5

D4

D3

D2

D1

D0

03

Dates

0

D20

D10

D8

D4

D2

D1

(default)

0

Undefined

04

Months

0

M10

M8

M4

M2

M1

(default)

0

Undefined

06

Years

Y80

Y40

Y20

Y10

Y8

Y4

Y2

Y1

(default)

Undefined

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

6. Trickle Charger

Addr.

Description

D7

D6

D5

D4

D3

D2

D1

D0

8

Trickle charger

TCS

DS

RS

(default)

0

1

0

1

0

PT7C4302WEX

PT7C4302WEX

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