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| 型号： | 71M6543F-IGTR/F |
| 厂商： | Maxim Integrated |
| 文件页数： | 70/154页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METER 64K FLSH 100LQFP |
| 标准包装： | 1,000 |
| 系列： | * |
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71M6543F/71M6543G Data Sheet
Name
SPI_SAFE
Location
270C[3]
Rst
0
Wk
0
Dir
R/W
Description
Limits SPI writes to SPI_CMD and a 16 byte region in
DRAM when set. No other write operations are permitted.
SPI_STAT contains the status results from the previous
SPI transaction
Bit 7 - 71M6543 ready error: the 71M6543 was not
ready to read or write as directed by the previous
command.
Bit 6 - Read data parity: This bit is the parity of all bytes
read from the 71M6543 in the previous command. Does
not include the SPI_STAT byte.
SPI_STAT
2708[7:0]
0
0
R
Bit 5 - Write data parity: This bit is the overall parity of
the bytes written to the 71M6543 in the previous
command. It includes CMD and ADDR bytes.
Bit 4:2 - Bottom 3 bits of the byte count. Does not
include ADDR and CMD bytes. One, two, and three
byte instructions return 111.
Bit 1 - SPI FLASH mode: This bit is zero when the
TEST pin is zero.
Bit 0 - SPI FLASH mode ready: Used in SPI FLASH
mode. Indicates that the flash is ready to receive
another write instruction.
SPI Flash Mode (SFM)
In normal operation, the SPI slave interface cannot read or write the flash memory. However, the
71M6543 supports a special flash mode (SFM) which facilitates initial programming of the flash memory.
When the 71M6543 is in this mode, the SPI can erase, read, and write the flash memory. Other memory
elements such as XRAM and IO RAM are not accessible in this mode. In order to protect the flash
contents, several operations are required before the SFM mode is successfully invoked.
In SFM mode, the 71M6543 supports n byte reads and dual-byte writes to flash memory. See the SPI
Transaction description on Page 68 for the format of read and write commands. Since the flash write
operation is always based on a two-byte word, the initial address must always be even. Data is written to
the 16-bit flash memory bus after the odd word is written.
When the 71M6543G is operating SFM, SPI single-byte transactions are used to write to FL_BANK[1:0]
(SFR 0xB6[1:0]) . During an SPI single-byte transaction, SPI_CMD[1:0] will over-write the contents of
FL_BANK[1:0] (SFR 0xB6[1:0]) . This will allow for access of the entire 128 KB flash memory while
operating in SFM.
In SFM mode, the MPU is completely halted. For this reason, the interrupt feature described in the SPI
Transaction section above is not available in SFM mode. The 71M6543 must be reset by the WD timer or
by the RESET pin in order to exit SFM mode.
Invoking SFM
The following conditions must be met prior to invoking SFM:
?
?
?
?
?
70
ICE_E = 1. This disables the watchdog and adds another layer of protection against inadvertent
Flash corruption.
The external power source (V3P3SYS, V3P3A) is at the proper level (> 3.0 VDC).
PREBOOT = 0 ( SFR 0xB2[7]) . This validates the state of the SECURE bit (SFR 0xB2[6]) .
SECURE = 0. This I/O RAM register indicates that SPI secure mode is not enabled. Operations are
limited to SFM Mass Erase mode if the SECURE bit = 1 (Flash read back is not allowed in Secure mode).
FLSH_UNLOCK[3:0] = 0010 ( I/O RAM 0x2702[7:4]) .
v2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6543FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube |
| 71M6543FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
| 71M6543G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation |
| 71M6543GH | 制造商:未知厂家 制造商全称:未知厂家 功能描述:电表IC |
| 71M6543GHT-IGT/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE, 128KB, PRES TEMP SENSOR, HI PREC - Bulk |
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