PCF2127T 查看數據表（PDF） - NXP Semiconductors.

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PCF2127T

Accurate RTC with integrated quartz crystal for industrial applications

NXP Semiconductors. 

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Table 5. Register overview …continued

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as T must always be written with logic 0. Bits labeled as X are undefined at

power-on and unchanged by subsequent resets.

Address Register name Bit

Reset value Reference

7

6

5

4

3

2

1

0

13h

Sec_timestp

-

SECOND_TIMESTP (0 to 59)

- XXX XXXX Table 70 on page 50

14h

Min_timestp

-

MINUTE_TIMESTP (0 to 59)

- XXX XXXX Table 72 on page 51

15h

Hour_timestp

-

-

AMPM

HOUR_TIMESTP (1 to 12) in 12-hour mode

- - XX XXXX Table 74 on page 51

HOUR_TIMESTP (0 to 23) in 24-hour mode

- - XX XXXX

16h

Day_timestp

-

-

DAY_TIMESTP (1 to 31)

- - XX XXXX Table 76 on page 52

17h

Mon_timestp

-

-

-

MONTH_TIMESTP (1 to 12)

- - - X XXXX Table 78 on page 52

18h

Year_timestp

YEAR_TIMESTP (0 to 99)

XXXX XXXX Table 80 on page 52

Aging offset register

19h

Aging_offset

-

-

-

-

AO[3:0]

- - - - 1000 Table 17 on page 14

RAM registers

1Ah

RAM_addr_MSB

-

-

-

-

-

-

-

RA8 - - - - - - - 0 Table 20 on page 16

1Bh

RAM_addr_LSB

RA[7:0]

0000 0000 Table 22 on page 16

1Ch

RAM_wrt_cmd

X

X

X

X

X

X

X

X XXXX XXXX Table 23 on page 16

1Dh

RAM_rd_cmd

X

X

X

X

X

X

X

X XXXX XXXX Table 24 on page 16

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