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参数资料
| 型号： | PSD813F1A-12JT |
| 厂商： | 意法半导体 |
| 英文描述： | Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V |
| 中文描述： | Flash在系统可编程（ISP）的周边8位MCU，5V的 |
| 文件页数： | 28/110页 |
| 文件大小： | 1685K |
| 代理商： | PSD813F1A-12JT |
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PSD813F1
28/110
Data Toggle
Checking the Data Toggle bit on DQ6 is a method
of determining whether a Program or Erase in-
struction is in progress or has completed. Figure
10
shows the Data Toggle algorithm.
When the MCU issues a programming instruction,
the embedded algorithm within the PSD begins.
The MCU then reads the location of the byte to be
programmed in Flash to check status. Data bit
DQ6 of this location will toggle each time the MCU
reads this location until the embedded algorithm is
complete. The MCU continues to read this loca-
tion, checking DQ6 and monitoring the Error bit on
DQ5. When DQ6 stops toggling (two consecutive
reads yield the same value), and the Error bit on
DQ5 remains
‘
0
’
, then the embedded algorithm is
complete. If the Error bit on DQ5 is
‘
1
’
, the MCU
should test DQ6 again, since DQ6 may have
changed simultaneously with DQ5 (see Figure
10
).
The Error bit at DQ5 will be set if either an internal
timeout occurred while the embedded algorithm
attempted to program the byte, or if the MCU at-
tempted 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 program-
ming algorithm has completed to compare the byte
that was written to Flash with the byte that was in-
tended to be written.
When using the Data Toggle method after an
erase instruction, Figure
10
still applies. DQ6 will
toggle until the erase operation is complete. A
‘
1
’
on DQ5 will indicate a timeout failure of the erase
operation, a
‘
0
’
indicates no error. The MCU can
read any location within the sector being erased to
get DQ6 and DQ5.
PSDsoft Express will generate ANSI C code func-
tions which implement these Data Toggling algo-
rithms.
Figure 10. Data Toggle Flowchart
READ
DQ5 & DQ6
START
READ DQ6
FAIL
PASS
AI01370B
D=
TOGGLE
NO
NO
YES
YES
DQ5
= 1
NO
YES
D=
TOGGLE
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PSD813F1A-12M | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V |
| PSD813F1-A-12MI | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash In-System Programmable ISP Peripherals For 8-bit MCUs |
| PSD813F1A-12MI | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V |
| PSD813F1A-12MT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V |
| PSD813F1A-12U | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V |
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