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PSD4235G2 Datasheet(PDF) 24 Page - STMicroelectronics

No. de pieza PSD4235G2
Descripción Electrónicos  Flash In-System-Programmable Peripherals for 16-Bit MCUs
PDF  93 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PSD4235G2 Datasheet(HTML) 24 Page - STMicroelectronics

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Preliminary Information
PSD4000 Series
21
Figure 3. Data Polling Flow Chart
START
READ DQ5 & DQ7
(DQ13 & DQ15)
at VALID EVEN ADDRESS
YES
YES
YES
NO
NO
NO
DQ7
(DQ15)
=
DATA7
(DATA15)
DQ5
(DQ13)
=1
READ DQ7
(DQ15)
FAIL
Program/Erase
Operation Failed
Issue Reset Instruction
PASS
Program/Erase
Operation is
Completed
DQ7
(DQ15)
=
DATA7
(DATA15)
The
PSD4000
Functional
Blocks
(cont.)
9.1.1.6.2 Data Toggle
Checking the Data Toggle bit on DQ6 (DQ14) is a method of determining whether a
Program or Erase instruction is in progress or has completed. Figure 4 shows the Data
Toggle algorithm.
When the MCU issues a programming instruction, the embedded algorithm within the
PSD4000 begins. The MCU then reads the location to be programmed in Flash to check
status. Data bit DQ6 (DQ14) of this location will toggle each time the MCU reads this
location until the embedded algorithm is complete. The MCU continues to read this
location, checking DQ6 (DQ14) and monitoring the Error bit on DQ5 (DQ13) . When
DQ6 (DQ14) stops toggling (two consecutive reads yield the same value), and the Error bit
on DQ5 (DQ13) remains ‘0’, then the embedded algorithm is complete. If the Error bit on
DQ5 (DQ13) is ‘1’, the MCU should test DQ6 (DQ14) again, since DQ6 (DQ14) may have
changed simultaneously with DQ5 (DQ13) (see Figure 4).
The Error bit at DQ5 (DQ13) will be set if either an internal timeout occurred while the
embedded algorithm attempted to program, or if the MCU attempted to program a ‘1’ to a
bit that was not erased (not erased is logic ‘0’).



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