參數(shù)資料
型號： PSD854F2A-90UT
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 256K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP64
封裝： ROHS COMPLIANT, TQFP-64
文件頁數(shù)： 58/128頁
文件大?。?/td> 1045K
代理商： PSD854F2A-90UT
PSD8XXFX
Programming Flash memory
Doc ID 7833 Rev 7
Figure 6.
Data Polling flowchart
8.2
Data Toggle
Checking the Toggle flag bit (DQ6) is a method of determining whether a program or erase
cycle is in progress or has completed. Figure 7 shows the Data Toggle algorithm.
When the MCU issues a Program instruction, the embedded algorithm within the PSD
begins. The MCU then reads the location of the byte to be programmed in Flash memory to
check status. The Toggle flag bit (DQ6) of this location toggles each time the MCU reads
this location until the embedded algorithm is complete. The MCU continues to read this
location, checking the Toggle flag bit (DQ6) and monitoring the Error flag bit (DQ5). When
the Toggle flag bit (DQ6) stops toggling (two consecutive reads yield the same value), and
the Error flag bit (DQ5) remains ’0,’ the embedded algorithm is complete. If the Error flag bit
(DQ5) is '1,' the MCU should test the Toggle flag bit (DQ6) again, since the Toggle flag bit
(DQ6) may have changed simultaneously with the Error flag bit (DQ5, see Figure 7).
The Error flag bit (DQ5) is set if either an internal timeout occurred while the embedded
algorithm attempted to program the byte, or if the MCU attempted to program a '1' to a bit
that was not erased (not erased is logic '0').
It is suggested (as with all Flash memories) to read the location again after the embedded
programming algorithm has completed, to compare the byte that was written to Flash
memory with the byte that was intended to be written.
When using the Data Toggle method after an Erase cycle, Figure 7 still applies. the Toggle
flag bit (DQ6) toggles until the Erase cycle is complete. A '1' on the Error flag bit (DQ5)
indicates a timeout condition on the Erase cycle; a '0' indicates no error. The MCU can read
READ DQ5 & DQ7
at VALID ADDRESS
START
READ DQ7
FAIL
PASS
AI01369B
DQ7
=
DATA
YES
NO
YES
NO
DQ5
= 1
DQ7
=
DATA
YES
NO
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PSD854F2V-12JI 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.0V 2M 120ns RoHS:否 制造商:Lattice 系列: 存儲類型:EEPROM 大電池數(shù)量:128 最大工作頻率:333 MHz 延遲時間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
PSD854F2V-12MI 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.0V 2M 120ns RoHS:否 制造商:Lattice 系列: 存儲類型:EEPROM 大電池數(shù)量:128 最大工作頻率:333 MHz 延遲時間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
PSD854F2V-90J 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.0V 2M 90ns RoHS:否 制造商:Lattice 系列: 存儲類型:EEPROM 大電池數(shù)量:128 最大工作頻率:333 MHz 延遲時間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
PSD854F2V-90M 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.0V 2M 90ns RoHS:否 制造商:Lattice 系列: 存儲類型:EEPROM 大電池數(shù)量:128 最大工作頻率:333 MHz 延遲時間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
PSD-8M-01 制造商:Richco 功能描述:CB SPT REST MNT NAT 8MM SPC
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