PCF85363ATLSLASHAX datasheet(14/86 Pages) NXP

14 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

• register address (2Eh)

• write data (clear STOP, 00h). Time starts counting from this point

• I2C STOP condition

7.3 Stop-watch mode time registers

These registers are coded in the BCD format to simplify application use.

Stop-watch mode is enabled by setting RTCM = 1. In stop-watch mode, the PCF85363A

counts from 100th seconds to 999 999 hours. There are no days, weekdays, months or

year registers.

Default state is:

Time

00 00 00:00:00.00

Monitor bits

OS = 1, EMON = 0 (see Section 7.2.2 and Section 7.2.3)

Bit positions labeled as - are not implemented and return 0 when read.

Upper-digit (ten’s place)

Digit (unit place)

Address Register name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00h

100th_seconds[1] 0 to 9

0 to 9

01h

Seconds

0 to 5

0 to 9

02h

Minutes

EMON 0 to 5

0 to 9

03h

Hours_xx_xx_00 0 to 9

0 to 9

04h

Hours_xx_00_xx 0 to 9

0 to 9

05h

Hours_00_xx_xx 0 to 9

0 to 9

06h

not used

07h

not used

Table 11. Time registers in stop-watch mode (RTCM = 1)

[1]

The 100th_seconds register is only available when the 100TH mode is enabled, see Section 7.13.1. When the 100TH

mode is disabled, this register always returns 0.

1. The 100th_seconds register is only available when the 100TH mode is enabled, see

Section 7.13.1. When the 100TH mode is disabled, this register always returns 0.

7.3.1 Setting and reading the time in stop-watch mode

Figure 10 shows the data flow and data dependencies starting from the 100 Hz clock tick.

During read operations, the time counting circuits (memory locations 00h through 07h)

are copied into an output register. The RTC continues counting in the background.

When reading or writing the time it is very important to make a read or write access in

one go, that is, setting or reading 100th_seconds through to HR_00_xx_xx should be

made in one single access. Failing to comply with this method could result in the time

becoming corrupted.

PCF85363A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1 — 18 June 2021

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