Fujitsu FR81S User Manual
CHAPTER 49: BUS DIAGNOSIS FUNCTION
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : BUS DIAGNOSIS FUNCTION
FUJITSU SEMICONDUCTOR CONFIDENTIAL
24
5.4. Example of operating bus diagnosis
This section explains the Example of operating bus diagnosis.
The example of operating the bus diagnosis is shown as follows.
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Data error detection operation
The data bus breaks down when the write (read) is accessed to the resource by byte access[7:0].
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Only DER[3] of the bus diagnosis status register corresponding to the resource is set to "1".
Notes:
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Even if the bus is out of order at this time by data bus[31:8], neither DER[2], DER[1] nor DER[0] are
set to "1".
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Only the bit corresponding to the access size is similarly set as for the word and the half-word access.
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Pseudo data error setting operation
When you want to make the error detected in bus diagnosis status register DER[0] in the test function
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Set "1" to bus error setting and data error setting DER[0] by the key code access, and do byte
access[31:24].
When DEN[3:1] is set, and the byte is accessed [31:24], the error might be detected in bus diagnosis status
register DER[3:1].
MB91520 Series
MN705-00010-1v0-E
2117