ADE5166 datasheet(105/148 Pages) AD

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Preliminary Technical Data

ADE5166/ADE5169/ADE5566/ADE5569

Rev. PrB | Page 105 of 148

Enabling Flash Protection by Emulator Commands

Another way to set the Flash protection bytes is to use the reserved

emulator commands available only in download mode. These

commands write directly to the SFRs and can be used to duplicate

the operation mentioned in the Enabling Flash Protection by

Code section. Once these Flash bytes are written, the part can

exit emulation mode by reset and the protections will be effective.

This method can be used in production and implemented after

downloading the program. The commands used for this opera-

tion are an extension of the commands listed in Application

Note uC004, Understanding the Serial Download Protocol,

available at www.analog.com.

•

Command with ASCII code I or 0x49 write the data into R0.

•

Command with ASCII code F or 0x46 write R0 into the

SFR address defined in the data of this command.

Omitting the protocol defined in uC004, the sequence to load

protections is similar to the sequence mentioned in the Enabling

Flash Protection by Code section, except that two emulator

commands are necessary to replace one assembly command.

For example, to write the protection value in EADRH, the two

following commands need to be executed:

•

Command I with Data = value of Protection Byte 0x3FFF

•

Command F with Data = 0xC7

Following this protocol, the protection can be written to the

Flash using the same sequence as mentioned in the Enabling

Flash Protection by Code paragraph. When the part is reset the

protection will be effective.

Notes on Flash Protection

The flash protection scheme is disabled by default so that none

of the pages of the flash are protected from reading or writing/

erasing.

The last page must be write-/erase-protected for the protection

scheme to work.

To activate the protection settings, the ADE5166/ADE5169/

ADE5566/ADE5569 must be reset after configuring the

protection.

After configuring protection on the last page and resetting the

part, protections that have been enabled can only be removed

by mass erasing the flash memory. The protection bits are never

truly write protected. Protection bits can be programmed

modified from a 1 to a 0, even after the last page has been

protected. In this way, more protection can be added but none

can be removed.

When the last page is read protected, the protection bits can still

be read by the user code. All other bits on this page are not

available for reading.

The protection scheme is intended to protect the end system.

Protection should be disabled while developing and emulating

code.

Flash Memory Timing

Typical program and erase times for the flash memory are

shown in Table 101.

Table 101. Flash Memory Program and Erase Times

Command

Bytes Affected

Flash Memory Timing

Write Byte

1 byte

30 us

Erase Page

512 bytes

20 ms

Erase All

62 kB

2.5 sec

Read Byte

1 bytes

100 ns

Note that the core microcontroller operation is idled until the

requested flash memory operation is complete. In practice, this

means that even though the Flash operation is typically initiated

with a two-machine-cycle MOV instruction (to write to the

flash control SFR (ECON, 0xB9), the next instruction is not

executed until the Flash/EE operation is complete. This means

that the core cannot respond to interrupt requests until the

Flash/EE operation is complete, although the core peripheral

functions such as counter/timers continue to count as

configured throughout this period.

IN CIRCUIT PROGRAMMING

Serial Downloading

The ADE5166/ADE5169/ADE5566/ADE5569 facilitate code

download via the standard UART serial port. The parts enter

serial download mode after a reset or a power cycle if the SDEN

pin is pulled low through an external 1 kΩ resistor. Once in

serial download mode, the hidden embedded download kernel

executes. This allows the user to download code to the full 62 kB

of flash memory while the device is in circuit in its target

application hardware.

Protection configured in the last page of the ADE5166/ADE5169/

ADE5566/ADE5569 affects whether flash memory can be

accessed in serial download mode. Read protected pages cannot

be read. Write/erase protected pages cannot be written or

erased. The configuration bits cannot be programmed in serial

download mode.

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