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ADE5166 数据表(PDF) 104 Page - Analog Devices |
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ADE5166 数据表(HTML) 104 Page - Analog Devices |
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104 / 148 page  ADE5166/ADE5169 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 0x8 command is issued and, therefore, the user must ensure that the correct value is written to the PROTKY SFR each time 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 active 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 to be set to 0xA3 prior to issuing the ECON protection command. MOV EADRL, #0F0H ; write address to F7F0h MOV FLSHKY, #3BH ; enable flash access 0xF7EF 0xF7FF WDOG LOCK WP 123 WP 122 WP 121 WP 120 Rev. 0 | Page 104 of 148 PROTKY 0xF600 0xF7EB WP 115 WP 114 WP 113 WP 112 WP 119 WP 118 WP 117 WP 116 WP 111 WP 110 WP 109 WP 108 WP 107 WP 106 WP 105 WP 104 WP 15 WP 14 WP 13 WP 12 WP 11 WP 10 WP 9 WP 8 WP 3 WP 2 WP 1 WP 0 WP 7 WP 6 WP 5 WP 4 RP 120–123 RP 116–119 RP 112–115 RP 108–111 RP 104–107 RP 100–103 RP 96–99 RP 92–95 RP 88–91 RP 84–87 RP 80–83 RP 76–79 RP 72–75 RP 68–71 RP 64–67 RP 60–63 RP 56–59 RP 52–55 RP 48–51 RP 44–47 RP 40–43 RP 36–39 RP 32–35 RP 0–3 RP 4–7 RP 8–11 RP 12–15 RP 16–19 RP 20–23 RP 24–27 RP 28–31 PROTECTION KEY Figure 91. Flash Protection in Page124 |
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