FEDL22620-01
ML22620
FDIRECT command
・
Command
0
0
0
1
0
0
0
0
1st byte
PRT7
PRT6
PRT5
PRT4
PRT3
PRT2
PRT1
PRT0
2nd byte
The FDIRECT command controls accesses to the serial flash memory using the clock-synchronous serial interface.
Input the command after inputting the PUP command.
If the protection code of the flash memory area is not 0x69 and the protection codes (PRT7 to PRT0) entered in the second
byte match the protection code set when creating sound ROM data, the serial flash memory access mode is entered. After that,
the flash memory can be accessed using the clock synchronous serial interface.
If the protection code set when creating sound ROM data is 0x69, the flash memory does not change to serial flash memory
access mode even if the code matches.
To cancel the serial flash memory access mode, insert a reset (RESETB = "L") and conduct initialization or turn off the
power supply.
For the protection codes of the flash memory area, refer to the "Speech LSI Utility Setting Items".
For the timing of the FDIRECT command, refer to the "FDIRECT command timing" in the timing chart.
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Summary of Contents for LAPIS Semiconductor ML22620
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