Firmware Description - Motorola M68HC08 Designer Reference Manual

USB and PS/2 Multimedia Keyboard Interface
1.4.2 In-Circuit Programming

1.5 Firmware Description

Designer Reference Manual
12
Freescale Semiconductor, Inc.
J3 and J7 contain all the signals for the MC68HC908JB8 to enter monitor
mode for In-Circuit Programming. The ICP requires J3 and J7 to be
connected with a cable to the ICP adaptor board, which is plugged-into
the M68HC08 Serial Programmer (M68SPGRM08) (see
Running the MCUScribe software on the PC allows erase, programming
and verification of the firmware in the MC68HC908JB8. The
communication baud rate is determined by the jumper setting of J3 of the
ICP adaptor board. Connect pins 1 and 2 of J3 for 9600bps and pins 2
and 3 for 19200bps.
Figure 1-6. In-Circuit Programming Connection
The firmware consists of three main parts:
• USB and PS/2 interface detection
• PS/2 main program and subroutines
• USB main program and subroutines
USB and PS/2 Multimedia Keyboard Interface
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Figure 1-6).
DRM014 — Rev 0
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