ADIS16480SLASHPCBZ datasheet(38/40 Pages) AD

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ADIS16480

Data Sheet

Rev. 0 | Page 38 of 40

For example, set SLP_CNT[7:0] = 0x64 (DIN = 0x9064), then

set SLP_CNT[8] = 1 (DIN = 0x9101) to start a sleep period of

100 seconds.

Table 151. 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 152, Table 153, Table 154,

and Table 155) provide four 16-bit registers for storing data.

Table 152. USER_SCR_1 (Page 2, Base Address = 0x74)

Bits

Description

[15:0]

User-defined

Table 153. USER_SCR_2 (Page 2, Base Address = 0x76)

Bits

Description

[15:0]

User-defined

Table 154. USER_SCR_3 (Page 2, Base Address = 0x78)

Bits

Description

[15:0]

User-defined

Table 155. 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 106). The real-time clock

data is available in the TIME_MS_OUT register (see Table 156),

TIME_DH_OUT register (see Table 157), 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 there is 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 =

0x8208, DIN = 0x8300) to back up these settings 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 ADIS16480 is turned off.

Table 156. 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 157. 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 158. 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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