ADE7166 datasheet(27/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 27 of 144

Table 22. Scratch Pad 2 SFR (SCRATCH2, 0xFC)

Bit

Mnemonic

Default

Description

7 to 0

SCRATCH2

Value can be written/read in this register. This value is maintained in all the power saving modes.

Table 23. Scratch Pad 3 SFR (SCRATCH3, 0xFD)

Bit

Mnemonic

Default

Description

7 to 0

SCRATCH3

Value can be written/read in this register. This value is maintained in all the power saving modes.

Table 24. Scratch Pad 4 SFR (SCRATCH4, 0xFE)

Bit

Mnemonic

Default

Description

7 to 0

SCRATCH4

Value can be written/read in this register. This value is maintained in all the power saving modes.

Clearing the Scratch Pad Registers (SCRATCH1, 0xFB to SCRATCH4, 0xFE)

Note that these scratch pad registers are only cleared when the part loses VDD and VBAT. They are not cleared by software, watchdog, or

PLL reset and, therefore, need to be set correctly in these situations.

Table 25. Power Control SFR (POWCON, 0xC5)

Bit

Mnemonic

Default

Description

RESERVED

Reserved.

METER_OFF

Set this bit to turn off the modulators and energy metering DSP circuitry to reduce power if

metering functions are not needed in PSM0.

RESERVED

This bit should be kept at 0 for proper operation.

COREOFF

Set this bit to shut down the core and enter PSM2 if in the PSM1 operating mode.

RESERVED

Reserved.

Controls the core clock frequency, fCORE. fCORE = 4.096 MHz/2CD.

CD[2:0]

Result (fCORE in MHz)

000

4.096

001

2.048

010

1.024

011

0.512

100

0.256

101

0.128

110

0.064

2 to 0

CD[2:0]

010

111

0.032

Writing to the Power Control SFR (POWCON, 0xC5)

Writing data to the POWCON SFR involves writing 0xA7 into the Key SFR (KYREG, 0xC1), which is described in Table 116, followed by

a write to the POWCON SFR. For example:

MOV KYREG,#0A7h

;Write KYREG to 0xA7 to get write access to the POWCON SFR

MOV POWCON,#10h

;Shutdown the core

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