參數(shù)資料
型號: PSD4256G6V-10UIT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 1M X 8 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 64/127頁
文件大小: 1091K
代理商: PSD4256G6V-10UIT
PSD4256G6V
Programming Flash memory
Figure 5.
Data polling flowchart
8.2
Data toggle
Checking the Toggle Flag bit (DQ6/DQ14) is another method of determining whether a
Program or Erase cycle is in progress or has completed. Figure 6 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 to be programmed in Flash memory to check the
status. The Toggle Flag bit (DQ6/DQ14) 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/DQ14) and monitoring the Error Flag bit (DQ5/DQ13). When the
Toggle Flag bit (DQ6/DQ14) stops toggling (two consecutive READs yield the same value),
and the Error Flag bit (DQ5/DQ13) remains '0,' the embedded algorithm is complete. If the
Error Flag bit (DQ5/DQ13) is '1,' the MCU should test the Toggle Flag bit (DQ6/DQ14) again,
READ DQ5 and DQ7
(DQ13 and DQ15)
at Valid Even Address
START
READ DQ7
(DQ15)
Program
or Erase
Cycle failed
Program
or Erase
Cycle is
complete
AI04920
Yes
No
Yes
No
DQ5
(DQ13)
= 1
DQ7
(DQ15)
=
Data7
(Data15)
Yes
No
Issue RESET
instruction
DQ7
(DQ15)
=
Data7
(Data15)
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