AN2295 Freescale Semiconductor / Motorola, AN2295 Datasheet - Page 9

• Manufacturer Part Number: AN2295
• Description: Developers Serial Bootloader for M68HC08 and HCS08 MCUs
• Manufacturer: Freescale Semiconductor / Motorola

Ident Command
The indent command (coded as ‘I’, $49) has no additional fields.
This command is immediately issued by the PC after communication is established. The purpose of the
indent command is to let the PC know several basic properties of the MCU being programmed. All
multi-byte fields are sent with MSB first.
RCS — Read Command Supported Flag
RSVD — Reserved
VER — Protocol Version
Freescale Semiconductor
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The RCS flag informs the PC whether the read command is supported (implemented). If not, all calls
to the read routine are ignored by the MCU and no response is sent back to the PC. The PC software
warns the user that no read capabilities are available.
These bits are reserved for future use, unused, and should be set to 0.
PC TO MCU COMMAND
MCU TO PC RESPONSE
* Dashed fields are not always implemented, data from the MCU may contain only an ACK character instead.
COMMAND
1 = Supported
0 = Not supported (usually due to memory constraints)
Version number and capability table — 1 byte
ADDRESS
Developer’s Serial Bootloader for M68HC08 and HCS08 MCUs, Rev. 6
Figure 7. Version Number and Capability Table
BIT
LENGTH
Figure 6. Typical Command and Response
RCS
7
6
RESERVED
DATA TO MCU
5
4
3
VERSION NUMBER
2
1
DATA FROM MCU
0
FC Protocol Description
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