XC886/888CLM
Bootstrap Loader
User’s Manual
18-15
V1.3, 2010-02
Bootstrap Loader, V1.0
18.1.2.7
The Activation of Mode A
Mode A is used to obtain a 4-byte data. The contents of the 4-byte data is determined by
the Option byte in the header block. The header block for this mode has the following
structure:
The Header Block
Mode Data Description:
Option
: This byte will determine the 4 bytes data to be sent to the host. Only option 00
H
is available to return the chip identification number, which is used to identify the particular
device variant.
00
H
- Chip Identification Number (MSB byte 1... LSB byte 4)
In Mode A, the header block is the only transfer block to be sent by the host. The
microcontroller will return an acknowledgement followed by 4 bytes of data to the host if
the header block is received successfully. If an invalid option is received, the
microcontroller will return 4 bytes of 00
H
.
00
H
(Header
Block)
Checksum
Mode Data
(5 bytes)
0A
H
(Mode A)
Option
(1 byte)
Not Used
(4 bytes)
*