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ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569

Rev. B | Page 38 of

152

3.3 V PERIPHERALS AND WAKE-UP EVENTS

Some of the 3.3 V peripherals are capable of waking the ADE7116/

ADE7156/ADE7166/ADE7169/ADE7566/ADE7569 from PSM2

mode. The events that can cause the devices to wake up from

PSM2 mode are listed in the Wake-Up Event column in Table 29.

The interrupt flag associated with these events must be cleared

prior to executing instructions that put the ADE7116/ADE7156/

ADE7166/ADE7169/ADE7566/ADE7569 in PSM2 mode after

wake-up.

Table 29. 3.3 V Peripherals and Wake-Up Events

3.3 V

Peripheral

Wake-

Event

Wake-Up

Enable Bits

Flag

Interrupt

Vector

Comments

Temperature

ADC

∆T

Maskable

The temperature ADC can wake up the ADE7156/ADE7166/

ADE7169/ADE7566/ADE7569. A pending interrupt is generated

according to the description in the Temperature Measurement

section. This wake-up event can be disabled by disabling temperature

measurements in the temperature and supply delta SFR (DIFFPROG,

Address 0xF3) in PSM2 mode. The temperature interrupt needs to be

serviced and acknowledged prior to entering PSM2 mode.

VDCIN ADC

ΔV

Maskable

FVADC

IPSM

The VDCIN measurement can wake up the ADE7156/ADE7166/

ADE7169/ADE7566/ADE7569. FVADC is set according to the

description in the External Voltage Measurement section. This wake-

up event can be disabled by clearing EVADC in the power manage-

ment interrupt enable SFR (IPSME, Address 0xEC); see Table 21. The

FVADC flag needs to be cleared prior to entering PSM2 mode.

Power Supply

Management

PSR

Nonmaskable

PSR

IPSM

The ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569 wake

up if the power supply is restored (if VSWOUT switches to be connected

to VDD). The VSWSOURCE flag, Bit 6 of the peripheral configuration SFR

(PERIPH, Address 0xF4), is set to indicate that VSWOUT is connected to VDD.

RTC

Midnight

Nonmaskable

Midnight

IRTC

The ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569

wake up at midnight every day to update their calendars. The RTC

interrupt needs to be serviced and acknowledged prior to entering

PSM2 mode.

Alarm

Maskable

ALARM

IRTC

An alarm can be set to wake the ADE7116/ADE7156/ADE7166/

ADE7169/ADE7566/ADE7569 after the desired amount of time. The

RTC alarm is enabled by setting the ALARM bit in the RTC configur-

ation SFR (TIMECON, 0xA1). The RTC interrupt needs to be serviced

and acknowledged prior to entering PSM2 mode.

I/O Ports1

INT0

INT0PRG = 1

IE0

The edge of the interrupt is selected by the IT0 bit in the TCON SFR

(TCON, Address 0x88). The IE0 flag bit in the TCON SFR is not affected.

The Interrupt 0 interrupt needs to be serviced and acknowledged

prior to entering PSM2 mode.

INT1

INT1PRG = 11x

IE1

The edge of the interrupt is selected by the IT1 bit in the TCON SFR

(TCON, Address 0x88). The IE1 flag bit in the TCON SFR is not affected.

The Interrupt 1 interrupt needs to be serviced and acknowledged

prior to entering PSM2 mode.

Rx Edge

RXPROG[1:0] =

PERIPH[7]

(RXFG)

An Rx edge event occurs if a rising or falling edge is detected on the

Rx line. The UART RxD flag needs to be cleared prior to entering

PSM2 mode.

External

Reset

RESET

Nonmaskable

If the RESET pin is brought low while the ASE7116/ADE7156/

ADE7166/ADE7169/ADE7566/ADE7569 are in PSM2 mode, they

wake up to PSM1 mode.

LCD

The LCD can be enabled/disabled in PSM2 mode. The LCD data

memory remains intact.

Scratch Pad

The four SCRATCHx registers remain intact in PSM2 mode.

1 All I/O pins are treated as inputs. The weak pull-up on each I/O pin can be disabled individually in the Port 0 weak pull-up enable SFR (PINMAP0, Address 0xB2), Port 1

weak pull-up enable SFR (PINMAP1, Address 0xB3), and Port 2 weak pull-up enable SFR (PINMAP2, Address 0xB4) to decrease current consumption. The interrupts can

be enabled or disabled.

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