ADIS16488SLASHPCBZ datasheet(31/36 Pages) AD

31 / 36 page

Data Sheet

ADIS16488

Rev. B | Page 31 of 36

Table 119. SLP_CNT (Page 3, Base Address = 0x10)

Bits

Description

[15:10]

Not used

Power-down mode

Normal sleep mode

[7:0]

Programmable time bits; 1 sec/LSB;

0x00 = indefinite

If the sleep mode and power-down mode bits are both set high,

the normal sleep mode (SLP_CNT[8]) bit takes precedence.

General-Purpose Registers

The USER_SCR_x registers (see Table 120, Table 121, Table 122,

and Table 123) provide four 16-bit registers for storing data.

Table 120. USER_SCR_1 (Page 2, Base Address = 0x74)

Bits

Description

[15:0]

User-defined

Table 121. USER_SCR_2 (Page 2, Base Address = 0x76)

Bits

Description

[15:0]

User-defined

Table 122. USER_SCR_3 (Page 2, Base Address = 0x78)

Bits

Description

[15:0]

User-defined

Table 123. USER_SCR_4 (Page 2, Base Address = 0x7A)

Bits

Description

[15:0]

User-defined

Real-Time Clock Configuration/Data

The VDDRTC power supply pin (see Table 5, Pin 23) provides

a separate supply for the real-time clock (RTC) function. This

enables the RTC to keep track of time, even when the main supply

(VDD) is off. Configure the RTC function by selecting one of

two modes in CONFIG[0] (see Table 74). The real-time clock

data is available in the TIME_MS_OUT register (see Table 124),

TIME_DH_OUT register (see Table 125), and TIME_YM_OUT

the time data registers start at 0x0000 when the device starts

up (or resets) and begin keeping time in a manner that is

similar to a stopwatch. When using the clock/calendar mode,

write the current time to the real-time registers in the following

sequence: seconds (TIME_MS_OUT[5:0]), minutes (TIME_

MS_OUT[13:8]), hours (TIME_DH_OUT[5:0]), day

(TIME_DH_OUT[12:8]), month (TIME_YM_OUT[3:0]),

and year (TIME_YM_OUT[14:8]). The updates to the timer

do not become active until a successful write to the TIME_

YM_OUT[14:8] byte. The real-time clock registers reflect the

newly updated values only after the next seconds tick of the

clock that follows the write to TIME_YM_OUT[14:8] (year).

Writing to TIME_ YM_OUT[14:8] activates all timing values;

therefore, always write to this location last when updating the

timer, even if the year information does not require updating.

Write the current time to each time data register after setting

CONFIG[0] = 1 (DIN = 0x8003, DIN = 0x8A01). Note that

CONFIG[1] provides a bit for managing daylight savings time.

After the CONFIG and TIME_xx_OUT registers are

configured, set GLOB_CMD[3] = 1 (DIN = 0x8003, DIN =

0x8204, DIN = 0x8300) to back these settings up in flash, and

use a separate 3.3 V source to supply power to the VDDRTC

function. Note that access to time data in the TIME_xx_OUT

registers requires normal operation (VDD = 3.3 V and full

startup), but the timer function only requires that VDDRTC =

3.3 V when the rest of the ADIS16488 is turned off.

Table 124. TIME_MS_OUT (Page 0, Base Address = 0x78)

Bits

Description

[15:14]

Not used

[13:8]

Minutes, binary data, range = 0 to 59

[7:6]

Not used

[5:0]

Seconds, binary data, range = 0 to 59

Table 125. TIME_DH_OUT (Page 0, Base Address = 0x7A)

Bits

Description

[15:13]

Not used

[12:8]

Day, binary data, range = 1 to 31

[7:6]

Not used

[5:0]

Hours, binary data, range = 0 to 23

Table 126. TIME_YM_OUT (Page 0, Base Address = 0x7C)

Bits

Description

[15]

Not used

[14:8]

Year, binary data, range = 0 to 99, relative to 2000 A.D.

[7:4]

Not used

[3:0]

Month, binary data, range = 1 to 12

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