D E M O 9 0 8 L B 8
M A R C H 2 4 , 2 0 0 5
8
MEMORY MAP
Figure 1: Memory Map
0x0000
0x0058
IO Registers
59 bytes
Unimplemented
0x0080
0x00FF
RAM
128 bytes
Unimplemented
0X037E
0X061F
Flash Programming
Routine ROM
674 bytes
Unimplemented
0xDE00
0xFDFF
Flash Memory
8192 bytes
0xFE00
0xFE0C
Status & Control
12 bytes
Unimplemented
0xFE20
0xFF7D
Monitor ROM
350 bytes
0xFF7E
Flash Block Protect
1 byte
Unimplemented
0xFFC0
Internal Osc Trim
1 byte
Unimplemented
0xFFDE
0xFFFF
Vectors
34 bytes
NOTE:
Attempts to execute code from an unimplemented address
range will cause an illegal address RESET
NOTE:
$FFF6 – $FFFD used for 8 security bytes
DEVELOPMENT SUPPORT
Application development and debug for the target MC68HC908LB8 is supported through the
MON08 debug interface. Monitor-mode access is available through the MON08 header and
through the DEBUG connector. The VTST_EN option jumper is used to force monitor mode
entry. This jumper must be installed as the MCU exits RESET to force monitor mode entry.
MON08 Header
A MON08 debug cable will attach to the 16-pin MON08 port. Several MON08 debug cables
supply VTST directly, thereby, eliminating the need to set the VTST_EN option jumper. The
MCU supports monitor mode communications at 9600 bps. Refer to MC68HC908LB8
documentation for further details.
