sak-c868p-1rr Infineon Technologies Corporation, sak-c868p-1rr Datasheet - Page 241

• Manufacturer Part Number: sak-c868p-1rr
• Description: 8 - Bit Cmos Microcontroller
• Manufacturer: Infineon Technologies Corporation

The MCU would let the host know whether a block has been successfully received by
sending out a response code. If a block is received correctly, an Acknowledge code
(55
bootstrap loader would send back a block type error (FF
is caused by two conditions. First condition is that the MCU receives a block type other
than the three implemented ones. The other is that the MCU receives the transfer blocks
in wrong sequences. For example, in working mode 0, immediately after the header
block is received, if another header block instead of a data block is received, the MCU
would consider this case be a wrong block type error. Besides wrong block type error,
the other error is checksum error. If the checksum comparison fails, the bootstrap loader
rejects the transfer block by sending back a checksum error code (FE
both error cases the bootstrap loader awaits the actual block from the host again.
Table 9-4
MCU after it receives each transfer block.
Table 9-4
Confirmation status
Successful
Blocktype error
Checksum error
9.2.2.2
When the bootstrap loader enters phase II, it first waits for an eight-byte long header
block from the host. The header block contains the information for the selection of the
working modes. Depending on this information, the bootstrap loader selects and
activates the desired working mode. If the MCU receives an incorrect header block, the
bootstrap loader sends, instead of an Acknowledge code, a checksum or block error
code to the host and awaits the header block again. In this case the host may react by
re-sending the header block.
User’s Manual
H
) is sent. There are two kinds of errors. If a wrong block type is detected, the
gives a summary of the response codes to be sent back to the host by the
Working modes selection
Types of Transfer Blocks
Response code to host
55
FF
FE
H
H
H
9-11
H
) to the host. This kind of error
The Bootstrap Loader
H
) to the host. In
V 1.0, 2003-01
C868