Fujitsu FR81S User Manual
CHAPTER 33: WILD REGISTER
6. Usage Example
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: WILD REGISTER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
12
6. Usage Example
This section explains a usage example of the wild register.
This section gives an example of using this function. In this example, the settings of this function are called
from an externally attached device after reset is released.
Figure 6-1 Usage Example
Start
Communication
Check received
Wild register
End
Obtain wild
• Call the wild register setting routine.
• Prepare communication with externally connected non-volatile
• End if no communication pa rtner.
• Receive 4 bytes (WREN, dummy 2 bytes)
• Receive 128 bytes (WRAR00 to WRAR15, WRDR00 to WRDR15)
• Receive 128 bytes (WRAR00 to WRAR15, WRDR00 to WRDR15)
• Set WRAR, WRDR, WREN in this order using recei ved data.
• Wild register function becomes active
• Wild register function becomes active
• Wild register setting routine ends and processing continues.
• Receive 4 bytes (CRC32)
• Use the CRC to check that no data was lost
• End if CRC not correct
• If CRC is correct, go to next
• End if CRC not correct
• If CRC is correct, go to next
memory or companion chips using CSIO, I
2
C, external bus, etc.
setting
from external
register content
chip
content
setting
End if CRC is not correct
MB91520 Series
MN705-00010-1v0-E
1173