參數(shù)資料
型號(hào)： μPD75F4246(A)
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8 Bit Single Chip Microcontrollers
中文描述： 8位單片機(jī)微控制器
文件頁數(shù)： 21/143頁
文件大?。?/td> 549K
代理商： ΜPD75F4246(A)
9
CHAPTER 2 BASIC FORMAT
2.4 Synchronization Detection Processing
Synchronization detection processing is a type of processing whose purpose is to confirm whether or not the
μ
PD75F4264 can operate normally after it has been switched to flash memory write mode. It does this by checking
how the
μ
PD75F4264 responds after the flash writer sends a command to it.
Figure 2-3. Flow of Synchronization Detection Processing
Note
ACK: Acknowledge
This signal (3CH) indicates when the
μ
PD75F4264’s processing ends normally.
A different signal (“NACK”) indicates when a processing fault has occurred (a “NACK” judgment is made
whenever a value other than “3CH” is returned at the timing for receiving the ACK signal).
2.4.1 Initialization wait time
After the
μ
PD75F4264 has been switched to flash memory write mode, the flash writer must wait (“initialization
wait”) until the
μ
PD75F4264’s programming firmware has been initialized and is ready to operate. This initialization
wait time must be at least as long as the
μ
PD75F4264’s oscillation wait time plus the time needed for the programming
firmware to initialize the
μ
PD75F4264 itself. For details of minimum initialization wait times, see
CHAPTER 6
μ
PD75F4264 PROGRAMMING CHARACTERISTICS (PRELIMINARY)
.
2.4.2 Synchronization check processing
The
μ
PD75F4264 uses synchronization check processing to determine whether or not the setup for communication
and write operations has been completed. Specifically, this processing checks whether or not an ACK signal was
returned after the flash writer sent a reset command to the
μ
PD75F4264. Up to 16 command send retries are permitted,
so that if an ACK is sent from the
μ
PD75F4264 within 16 retries, it is confirmed that the
μ
PD75F4264 is ready for
programming. For description of the reset command’s format, see
CHAPTER 4 SAMPLE PROGRAMS
.
Synchronization
detection
End
(Normal end)
End
(Synchronization detection failed)
Wait processing for
PD75F4264 initialization
μ
Send reset command (00H)
NO
NO
YES
YES
Receive ACK
Note
Retry 16 times
··· See
2.4.1 Initialization wait time.
··· See
2.4.2 Synchronization check
processing.
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