ADE5166 datasheet(111/156 Pages) AD

111 / 156 page

ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 111 of 156

MOV ECON, #08H

;issue protection

command

Note that after the PROTKY has been activated by a reset, any

further changes to the protection require the new 8-bit protection

key to be written to the PROTKY SFR prior to issuing the ECON

command. The PROTKY SFR is cleared automatically when the

ECON 0x08 command is issued and, therefore, the user must

ensure that the correct value is written to the PROTKY SFR

each time that the protection scheme is changed.

;enable write/erase protection on last page

(this is required for any protection to be

activated)

MOV EDATA, #0F7H

; clear bit WP123

MOV EADRL, #0FFH

; write address to F7FFh

MOV FLSHKY, #3BH

; enable flash access

The most significant bit of 0xF7FF is used to enable the lock

mechanism for the watchdog (see the Watchdog Timer section

for more information).

MOV ECON, #08H

;issue protection

command

;set up PROTKY to A3h

The following code provides an example of how the write/erase

protection can be enabled on the first page and the PROTKY set

to 0xA3. Note that to activate the following protection, the part

requires a reset.

MOV EDATA, #0A3H

; set PROTKY to A3h

MOV EADRL, #0EBH

; write address to F7EBh

MOV FLSHKY, #3BH

; enable flash access

; enable write/erase protection on the first

page only

MOV ECON, #08H

; issue protection

command

MOV EDATA, #0FEH

; clear bit WP 0

Note that after the PROTKY is changed to 0xA3, as shown in

the preceding example code, all future modifications of the pro-

tection scheme require that the PROTKY SFR be set to 0xA3

prior to issuing the ECON protection command.

MOV EADRL, #0F0H

; write address to F7F0h

MOV FLSHKY, #3BH

; enable flash access

PROTKY

0xF600

0xF7EB

0xF7EF

0xF7FF

WDOG

LOCK

123

122

121

120

115

114

113

112

119

118

117

116

107

106

105

104

111

110

109

108

108–111

104–107

100–103

96–99

64–67

68–71

72–75

76–79

80–83

84–87

88–91

92–95

32–35

36–39

40–43

44–47

48–51

52–55

56–59

60–63

0–3

4–7

8–11

12–15

16–19

20–23

24–27

28–31

120–123

116–119

112–115

PROTECTION KEY

Figure 96. Flash Protection in Page 124

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