ade7518 Analog Devices, Inc., ade7518 Datasheet - Page 22

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

ADE7518
POWER MANAGEMENT
The ADE7518 has elaborate power management circuitry that manages the regular power supply to battery switchover and power supply
failures. The power management functionalities can be accessed directly through the 8052 SFRs (see Table 14).
Table 14. Power Management SFRs
SFR Address
0xEC
0xF5
0xF8
0xFF
0xF4
0xC5
0xFB
0xFC
0xFD
0xFE
POWER MANAGEMENT REGISTER DETAILS
Table 15. Interrupt Pins Configuration SFR (INTPR, 0xFF)
Bit
7
6 to 5
4
3 to 1
0
Writing to the Interrupt Pins Configuration SFR (INTPR, 0xFF)
To protect the RTC from runaway code, a key must be written to the Key SFR (KYREG, 0xC1) to obtain write access to INTPR. KYREG
(see Table 105) should be set to 0xEA to unlock this SFR and then reset to zero after a timekeeping register is written to. The RTC
registers can be written using the following 8052 assembly code:
MOV
MOV
KYREG, #0EAh
INTPR, #080h
Mnemonic
RTCCAL
FSEL[1:0]
Reserved
INT1PRG[2:0]
INT0PRG
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
00
N/A
000
0
Mnemonic
IPSME
BATPR
IPSMF
INTPR
PERIPH
POWCON
SCRATCH1
SCRATCH2
SCRATCH3
SCRATCH4
Description
Controls the RTC calibration output. When this bit is set, the RTC calibration frequency selected by
FSEL[1:0] is output on the P0.2/CF1/RTCCAL pin.
Sets the RTC calibration output frequency and calibration window.
FSEL[1:0]
00
01
10
11
Controls the function of INT1.
INT1PRG[2:0]
x00
x01
01x
11x
Controls the function of INT0.
INT0PRG
0
1
Description
Power Management Interrupt Enable. See Table 19.
Battery Switchover Configuration. See Table 17.
Power Management Interrupt Flag. See Table 16.
Interrupt Pins Configuration. See Table 15.
Peripheral Configuration SFR. See Table 18.
Power Control. See Table 24.
Scratch Pad 1. See Table 20.
Scratch Pad 2. See Table 21.
Scratch Pad 3. See Table 22.
Scratch Pad 4. See Table 23.
Result (Calibration Window, Frequency)
30.5 sec, 1 Hz
30.5 sec, 512 Hz
0.244 sec, 500 Hz
0.244 sec, 16.384 kHz
Result
GPIO enabled
BCTRL enabled
INT1 input disabled
INT1 input enabled
Result
INT0 input disabled
INT0 input enabled
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