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参数资料
| 型号： | 71M6542F-IGT/F |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP100 |
| 封装： | LEAD FREE, LQFP-100 |
| 文件页数： | 110/165页 |
| 文件大小： | 2208K |
| 代理商： | 71M6542F-IGT/F |
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v1.1
2008–2011 Teridian Semiconductor Corporation
49
The page erase sequence is:
Write the page address to FLSH_PGADR[5:0] (SFR 0xB7[7:2]).
Write the pattern 0x55 to the FLSH_ERASE register (SFR 0x94).
Program Security
When enabled, the security feature limits the ICE to global flash erase operations only. All other ICE
operations are blocked. This guarantees the security of the user’s MPU and CE program code. Security
is enabled by MPU code that is executed in a 64 CKMPU cycle pre-boot interval before the primary boot
sequence begins. Once security is enabled, the only way to disable it is to perform a global erase of the
flash, followed by a chip reset.
The first 32 cycles of the MPU boot code are called the pre-boot phase because during this phase the
ICE is inhibited. A read-only status bit, PREBOOT (SFR 0xB2[7]), identifies these cycles to the MPU.
Upon completion of pre-boot, the ICE can be enabled and is permitted to take control of the MPU.
The security enable bit, SECURE (SFR 0xB2[6]), is reset whenever the chip is reset. Hardware associated
with the bit permits only ones to be written to it. Thus, pre-boot code may set SECURE to enable the security
feature but may not reset it. Once SECURE is set, the pre-boot code is protected and no external read of
program code is possible.
Specifically, when the SECURE bit is set, the following applies:
The ICE is limited to bulk flash erase only.
Page zero of flash memory, the preferred location for the user’s pre-boot code, may not be
page-erased by either MPU or ICE. Page zero may only be erased with global flash erase.
Write operations to page zero, whether by MPU or ICE are inhibited.
The 71M6541D/F and 71M6542F also include hardware to protect against unintentional Flash write and
erase. To enable flash write and erase operations, a 4-bit hardware key that must be written to the
FLSH_UNLOCK[3:0] field. The key is the binary number ‘0010’. If FLSH_UNLOCK[3:0] is not ‘0010’, the
Flash erase and write operation is inhibited by hardware. Proper operation of this security key requires
that there be no firmware function that writes ‘0010’ to FLSH_UNLOCK[3:0]. The key should be written by
the external SPI master, in the case of SPI flash programming (SFM mode), or through the ICE interface
in the case of ICE flash programming. When a boot loader is used, the key should be sent to the boot
load code which then writes it to FLSH_UNLOCK[3:0]. FLSH_UNLOCK[3:0] is not automatically reset. It
should be cleared when the SPI or ICE has finished changing the Flash. Table 40 summarizes the I/O
RAM registers used for flash security.
Table 40: Flash Security
Name
Location
Rst
Wk
Dir
Description
FLSH_UNLOCK[3:0]
2702[7:4]
0
R/W Must be a 2 to enable any flash modification.
See the description of Flash security for
more details.
SECURE
SFR B2[6]
0
R/W Inhibits erasure of page 0 and flash addresses
above the beginning of CE code as defined by
CE_LCTN[5:0] (I/O RAM 0x2109[5:0]). Also
inhibits the read of flash via the ICE and SPI
ports.
SPI Flash Mode
In normal operation, the SPI slave interface cannot read or write the flash memory. However, the
71M6541D/F and 71M6542F contain a Special Flash Mode (SFM) that facilitates initial (production)
programming of the flash memory. When the 71M654x is in SFM mode, the SPI interface can erase, read,
and write the flash. Other memory elements such as XRAM and I/O RAM are not accessible to the
SPI in this mode. In order to protect the flash contents, several operations are required before the SFM
mode is successfully invoked.
Details on the SFM are in 2.5.10 (SPI Slave Port).
相关PDF资料 |
PDF描述 |
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| 71M6542G-IGTR/F | SPECIALTY ANALOG CIRCUIT, PQFP100 |
| 71M6541G-IGTR/F | SPECIALTY ANALOG CIRCUIT, PQFP64 |
| 71M6541F-IGTR/F | SPECIALTY ANALOG CIRCUIT, PQFP64 |
| 71M6541D-IGTR/F | SPECIALTY ANALOG CIRCUIT, PQFP64 |
| 71M6542F-IGTR/F | SPECIALTY ANALOG CIRCUIT, PQFP100 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6542F-IGTR/F | 功能描述:计量片上系统 - SoC Precision Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6542FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:1-PHASE SOC 128KB WITH PREC TEMP SENSOR - Rail/Tube |
| 71M6542FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:1-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
| 71M6542G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:71M6541D/71M6541F/71M6541G/71M6542F/71M6542G 是 TeridianTM 的第4 代高集成度单相电表SoC |
| 71M6542G-IGT/F | 功能描述:计量片上系统 - SoC 1-Phase Metering SOC with 128KB Flash RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
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