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參數(shù)資料
| 型號： | PSD813F5V-20MT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52 |
| 封裝： | PLASTIC, QFP-52 |
| 文件頁數(shù)： | 19/103頁 |
| 文件大小： | 1180K |
| 代理商： | PSD813F5V-20MT |
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PSD8XXF2/3/4/5
22/103
Programming Flash Memory
Flash memory must be erased prior to being pro-
grammed. A byte of Flash memory is erased to all
1s (FFh), and is programmed by setting selected
bits to 0. The MCU may erase Flash memory all at
once or by-sector, but not byte-by-byte. However,
the MCU may program Flash memory byte-by-
byte.
The primary and secondary Flash memories re-
quire the MCU to send an instruction to program a
byte or to erase sectors (see Table 8).
Once the MCU issues a Flash memory Program or
Erase instruction, it must check for the status bits
for completion. The embedded algorithms that are
invoked inside the PSD8XXFX support several
means to provide status to the MCU. Status may
be checked using any of three methods: Data Poll-
ing, Data Toggle, or Ready/Busy (PC3).
Data Polling. Polling on the Data Polling Flag
(DQ7) bit is a method of checking whether a Pro-
gram or Erase cycle is in progress or has complet-
ed. Figure 5 shows the Data Polling algorithm.
When the MCU issues a Program instruction, the
embedded algorithm within the PSD8XXFX be-
gins. The MCU then reads the location of the byte
to be programmed in Flash memory to check sta-
tus. The Data Polling Flag (DQ7) bit of this location
becomes the complement of b7 of the original data
byte to be programmed. The MCU continues to
poll this location, comparing the Data Polling Flag
(DQ7) bit and monitoring the Error Flag (DQ5) bit.
When the Data Polling Flag (DQ7) bit matches b7
of the original data, and the Error Flag (DQ5) bit
remains 0, the embedded algorithm is complete. If
the Error Flag (DQ5) bit is 1, the MCU should test
the Data Polling Flag (DQ7) bit again since the
Data Polling Flag (DQ7) bit may have changed si-
multaneously with the Error Flag (DQ5) bit (see
The Error Flag (DQ5) bit is set if either an internal
time-out 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 the Flash memory with the
byte that was intended to be written.
When using the Data Polling method during an
Erase cycle, Figure 5 still applies. However, the
Data Polling Flag (DQ7) bit is 0 until the Erase cy-
cle is complete. A 1 on the Error Flag (DQ5) bit in-
dicates a time-out condition on the Erase cycle; a
0 indicates no error. The MCU can read any loca-
tion within the sector being erased to get the Data
Polling Flag (DQ7) bit and the Error Flag (DQ5) bit.
PSDsoft Express generates ANSI C code func-
tions which implement these Data Polling algo-
rithms.
Figure 5. Data Polling Flowchart
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 |
|---|---|
| PSD813F5VA-15J | 功能描述:SPLD - 簡單可編程邏輯器件 3.0V 1M 150ns RoHS:否 制造商:Texas Instruments 邏輯系列:TICPAL22V10Z 大電池數(shù)量:10 最大工作頻率:66 MHz 延遲時間:25 ns 工作電源電壓:4.75 V to 5.25 V 電源電流:100 uA 最大工作溫度:+ 75 C 最小工作溫度:0 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:DIP-24 |
| PSD813F5VA-15U | 功能描述:SPLD - 簡單可編程邏輯器件 U 511-PSD813F2VA-15U RoHS:否 制造商:Texas Instruments 邏輯系列:TICPAL22V10Z 大電池數(shù)量:10 最大工作頻率:66 MHz 延遲時間:25 ns 工作電源電壓:4.75 V to 5.25 V 電源電流:100 uA 最大工作溫度:+ 75 C 最小工作溫度:0 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:DIP-24 |
| PSD813FH-15J | 制造商:WSI 功能描述: |
| PSD813FH-90J | 制造商:WSI 功能描述: |
| PSD813FN-15J | 制造商:WSI 功能描述: |
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