ADE7569 datasheet(120/148 Pages) AD

120 / 148 page

ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 120 of 148

Note: This register is reset after a watchdog reset, an external reset or a

power on reset (POR).

Table 118. Interrupt pins configuration SFR (INTPR, 0xFF)

Bit

Location

Bit

Mnemonic

Default

Value

Description

RTCCAL

Control RTC calibration output

When set, the RTC calibration frequency selected by FSEL[1:0] is output on the

P0.2/CF1/RTCCAL pin.

Sets RTC calibration output frequency and calibration window

FSEL[1:0]

Calibration window, frequency

30.5 seconds, 1Hz

30.5 seconds, 512 Hz

0.244 seconds, 500Hz

6-5

FSEL[1:0]

0.244 seconds, 16.384 kHz

Reserved

Controls the function of INT1T

INT1PRG[2:0]

Function

GPIO

BCTRL

INT1 input disabled

3-1

INT1PRG[2:0]

000

INT1 input enabled

Controls the function of INT0

INT0PRG

Function

INT0 input disabled

INT0PRG

INT0 input enabled

Table 119. Key SFR (KYREG, 0xC1)

Bit

Location

Bit

Mnemonic

Default

Value

Description

7-0

KYREG

Write 0xA7 to the KYREG SFR before writing the POWCON SFR, to unlock it

Write 0xEA to the KYREG SFR before writing to the HTHSEC, SEC, MIN, or

HOUR timekeeping register to unlock it..

READ AND WRITE OPERATIONS

Writing the RTC Registers

The RTC circuitry runs off a 32.768kHz clock. The timekeeping

registers, HTHSEC, SEC, MIN, HOUR are updated with a

32.768 kHz clock. However, the TIMECON and INTVAL SFRs

are updated with a 128Hz clock. It takes up to two 128Hz clock

cycles from when the MCU writes the TIMECON or INTVAL

To protect the RTC timekeeping registers from runaway code, a

key must be written to the KYREG register to obtain write

access to the HTHSEC, SEC, MIN and HOUR registers. The

KYREG should be set to 0xEA to unlock the timekeeping

registers and is reset to zero after a timekeeping register is

written to. The RTC registers can be written using the following

8052 assembly code:

MOV

RTCKey, #0EAh

CALL

UpdateRTC

…

UpdateRTC:

MOV

KYREG, RTCKey

MOV

SEC, #30

MOV

KYREG, RTCKey

MOV

MIN, #05

MOV

KYREG, RTCKey

MOV

HOUR, #04

RET

Reading the RTC Counter SFRs

The RTC cannot be stopped to read the current time because

stopping the RTC would introduce an error in its timekeeping.

So the RTC is read on the fly. Therefore the counter registers

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