ade7518 Analog Devices, Inc., ade7518 Datasheet - Page 31

• Manufacturer Part Number: ade7518
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

3.3 V PERIPHERALS AND WAKE-UP EVENTS
Some of the 3.3 V peripherals are capable of waking the ADE7518
from PSM2. The events that can cause the ADE7518 to wake up
from PSM2 are listed in the Wake-Up Event column in Table 27.
Table 27. 3.3 V Peripherals and Wake-Up Events
3.3 V
Peripheral
Power Supply
RTC
I/O Ports
External Reset
LCD
Scratch Pad
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, 0xB2), Port 1 Weak
Pull-Up Enable SFR (PINMAP1, 0xB3), and Port 2 Weak Pull-Up Enable SFR (PINMAP2, 0xB4) to decrease current consumption. The interrupts can be enabled/disabled.
Management
1
Wake-Up
Event
PSR
Midnight
Alarm
INT0
INT1
Rx Edge
RESET
Wake-Up
Enable Bits
Nonmaskable
Nonmaskable
Maskable
INT0PRG = 1
INT1PRG[2:0] =
11x
RXPROG[1:0] =
11
Nonmaskable
Flag
Midnight
Alarm
PERIPH[7]
(RXFLAG)
PSR
Rev. 0 | Page 31 of 128
Interrupt
Vector
IRTC
IRTC
IE0
IE1
IPSM
The interrupt flag associated with these events must be cleared
prior to executing instructions that put the ADE7518 in PSM2
mode after wake-up.
Comments
The ADE7518 wakes up if the power supply is restored (if
V
flag, Bit 6 of the Peripheral Configuration SFR (PERIPH, 0xF4),
is set to indicate that V
The ADE7518 wakes up at midnight every day to update its
calendars. The RTC interrupt needs to be serviced and
acknowledged prior to entering PSM2 mode.
An alarm can be set to wake the ADE7518 after the desired
amount of time. The RTC alarm is enabled by setting the
ALARM bit in the RTC Configuration SFR (TIMECON, 0xA1).
The RTC interrupt needs to be serviced and acknowledged
prior to entering PSM2 mode.
The edge of the interrupt is selected by Bit IT0 in the TCON
register. The IE0 flag bit in the TCON register is not affected.
The Interrupt 0 interrupt needs to be serviced and
acknowledged prior to entering PSM2 mode.
The edge of the interrupt is selected by Bit IT1 in the TCON
register. The IE1 flag bit in the TCON register is not affected.
The Interrupt 1 interrupt needs to be serviced and
acknowledged prior to entering PSM2 mode.
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.
If the RESET pin is brought low while the ADE7518 is in
PSM2, the ADE7518 wakes up to PSM1.
The LCD can be enabled/disabled in PSM2. The LCD data
memory remains intact.
The four SCRATCHx registers remain intact in PSM2.
SWOUT
switches to be connected to V
SWOUT
is connected to V
DD
). The VSWSOURCE
DD
.
ADE7518