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| 型號(hào)： | ADE7169F16 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
| 中文描述： | 單相電能計(jì)量集成電路8052微控制器，RTC和LCD驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 97/140頁(yè) |
| 文件大?。?/td> | 1359K |
| 代理商： | ADE7169F16 |
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Preliminary Technical Data
ADE7169F16
0x3FFF
Rev. PrD | Page 97 of 140
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PAGE 0
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0x1FFF
READ
PROTECT
BIT 0
READ
PROTECT
BIT 1
READ
PROTECT
BIT 2
READ
PROTECT
BIT 3
0x2000
PAGE 16
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PAGE 31
READ
PROTECT
BIT 4
READ
PROTECT
BIT 5
READ
PROTECT
BIT 6
READ
PROTECT
BIT 7
CONTAINS
PROTECTION
SETTINGS
Figure 66: Flash Memory Organization
The flash memory can be protected from read or write/erase
access. The protection is implemented in part of the last page of
the flash memory, Page 31. Four of the bytes from this page are
used to set up write/erase protection for each of the pages.
Another byte is used for configuring read protection of the flash
memory. The read protection is selected for groups of four
pages. Finally, there is a byte used to store the key required for
modifying the protection scheme. If any code protection is
required, the last page of flash memory must be write/erase
protected at a minimum. The implication of write/erase
protecting the last page is that the content of the 506 bytes in
this page that are available to the user must not change.
Thus it is recommended that if code protection is enabled, this
last page should be used for program memory only if the
firmware does not need to be updated in the field. If the
firmware must be protected and can be updated at a future date,
the last page should be used only for constants used by the
program code that will not need to be read during emulation or
debug.
Therefore, Pages 0 through 30 are for general program and data
memory use. It is recommended that Page 31 is used for
constants or code that will not need to be updated. Note that the
last 6 bytes of Page 31 are reserved for protecting the flash
memory.
USING THE FLASH MEMORY
The 16 kbytes of Flash memory are configured as 32 pages, each
of 512 bytes. As with the other ADE7169F16 peripherals, the
interface to this memory space is via a group of registers
mapped in the SFR space – see . A data register, EDATA, holds
the byte of data to be accessed. The byte of flash memory is
addressed via the EADRH and EADRL registers. The Flash
SFRs
Table 83. Flash SFRs
SFR
Address
Default
Value
Bit
Addressable
Description
ECON
0xB9
0x00
No
Flash
Control
Flash Key
Flash
Protection
Key
FLSHKY
PROTKY
0xBA
0xBB
0xFF
0xFF
No
No
EDATA
0xBC
0x00
No
Flash Data
PROTB0
0xBD
0xFF
No
Flash W/E
Protection 0
PROTB1
0xBE
0xFF
No
Flash W/E
Protection 1
PROTR
0xBF
0xFF
No
Flash Read
protection
EADRL
0xC6
0x00
No
Flash Low
address
EADRH
0xC7
0x00
No
Flash High
address
Finally, ECON is an 8-bit control register that can be written to
with one of seven Flash memory access commands to trigger
various read, write, erase, and verify functions. Figure 67
demonstrates the steps required for access to the flash memory.
FALSE: ACCESS DENIED
ECON=1
ECON
FLSHKY=0x3B
ADDRESS
DECODER
FLSHKY
EADRL
EADRH
Address
Flash Protection Key
ACCESS
ALLOWED
PROTECTION
DECODER
Command
TRUE: ACCESS ALLOWED
ECON=0
Figure 67: Flash Memory Read/Write/Erase Protection Block Diagram
ECON—Flash/EE Memory Control SFR
Programming Flash memory is done through the Flash
memory control Flash Control SFR (ECON, 0xB9). This SFR
allows the user to read, write, erase, or verify the 16 kbytes of
Flash memory. As a method of security, a key must be written
to the FLSHKY register to initiate any user access to the flash
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| ADE75 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
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