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参数资料
| 型号： | UPSD3233AV-24T1T |
| 厂商： | 意法半导体 |
| 英文描述： | Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM |
| 中文描述： | 闪存可编程系统设备与8032微控制器核心和64Kbit SRAM的 |
| 文件页数： | 112/176页 |
| 文件大小： | 1081K |
| 代理商： | UPSD3233AV-24T1T |
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PSD323X
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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. Howev-
er, the MCU may program Flash memory byte-by-
byte.
The primary and secondary Flash memories re-
quire the MCU to send an instructionto program a
byte or to erase sectors (see Table 85).
Once theMCU issues a Flash memoryProgram or
Erase instruction, it must check for the status bits
for completion. Theembedded algorithms that are
invoked support several means to provide status
to the MCU. Status may be checked using any of
three methods: Data Polling, Data Toggle, or
Ready/Busy (PC3).
Data Polling.
Polling on the Data Polling Flag Bit
(DQ7) isa method of checking whether a Program
or Erase cycle is in progress or has completed.
Figure 52 shows the Data Polling algorithm.
When the MCU issues a Program instruction, the
embedded algorithm begins.The MCU then reads
the locationof thebyte to be programmed in Flash
memory to check status. The Data Polling Flag Bit
(DQ7) of this location becomes the complement of
b7 of the originaldata byte to be programmed. The
MCU continues to poll thislocation, comparing the
Data Polling FlagBit (DQ7) and monitoring theEr-
ror Flag Bit (DQ5). When the Data Polling Flag Bit
(DQ7) matches b7 of the original data, and the Er-
ror FlagBit (DQ5)remains ’0,’ the embedded algo-
rithm is complete. If the Error Flag Bit (DQ5) is ’1,’
the MCU should test the Data Polling Flag Bit
(DQ7) again since the Data Polling Flag Bit (DQ7)
may have changed simultaneously with the Error
Flag Bit (DQ5) (see Figure 52).
The Error Flag Bit (DQ5) 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 issuggested (as withall Flash memories)to read
the location again after the embedded program-
ming algorithm has completed, to compare the
byte that was writtento the Flash memory with the
byte that was intended to be written.
When using the Data Polling method during an
Erase cycle, Figure 52 still applies. However, the
Data Polling Flag Bit (DQ7)is ’0’until the Erasecy-
cle iscomplete. A ’1’on theError Flag Bit(DQ5) 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 Bit (DQ7) and the Error Flag Bit
(DQ5).
PSDsoft Express generates ANSI C code func-
tions which implement these Data Polling algo-
rithms.
Figure 52. 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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相关代理商/技术参数 |
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| UPSD3233AV-24T6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3233AV-24T6T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core |
| UPSD3233AV-24U1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3233AV-24U1T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core |
| UPSD3233AV-24U6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
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