AN2295 Freescale Semiconductor / Motorola, AN2295 Datasheet - Page 12

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

FC Protocol Description
Read Command
The read command (coded as ‘R’, $52) has both address and data fields. Address contains the first
address to be programmed; the single byte is the length of data to be read. The start address is a 2-byte
field, MSB first. The length is a 1-byte field.
The MCU sends this number of read bytes back to the PC.
Quit Command
The quit command (coded as ‘Q’, $51) has no address or data fields. Execution of bootloader code is
finished immediately, and the user code is started. No ACK ($FC) character is sent back to the PC.
Bootloader User Table
The bootloader user table is a reprogrammable memory area intended for storage of bootloader-specific
data. This memory area is not available for the user program. For memory allocation of this table refer to
FC Protocol, Version 1, M68HC908
12
PC TO MCU COMMAND
MCU TO PC RESPONSE
PC TO MCU COMMAND
MCU TO PC RESPONSE
R ($52)
Q ($51)
ADDRESS
START
Developer’s Serial Bootloader for M68HC08 and HCS08 MCUs, Rev. 6
LENGTH
Implementation.
Figure 12. Read Command
Figure 13. Quit Command
<NO RESPONSE>
BINARY DATA
Freescale Semiconductor