Freescale Semiconductor Microcontrollers, Manual

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MON08 Interface Connection
Connection Procedure
340 Microcontrollers Debugger Manual
STATUS Area
The status area of the MON08 16-Pin Header Signals tab consists of one status string
following the
Status: label, and seven items which list the state of the last attempt to
connect to a target and pass security. The description for these items is as follows:
• 0 – ICS Hardware loopback detected:
Every ICS or board which supports MON08 has a serial loopback in hardware
which, by connecting the transmit and receive lines, automatically echoes characters
from the PC. A valid character transmitted from the PC is echoed once by the
loopback circuitry on the board and once by the monitor of the target processor itself.
This status indicates whether the first echoed character from the hardware loopback
was received when one of the security bytes was transmitted. If the status is ‘N’,
which indicates that the character was not received, it is most likely due to one of the
following reasons:
– Wrong Com Port specified.
– The baud rate specified was incorrect (probably too low).
– The ICS/Target is not connected.
– No Power to the ICS.
If this status bit is ‘N’, you must correct this before analyzing the rest of the status
bits.
• 1 – Device echoed some security bytes:
The monitor resident in a 68HC08 device automatically echoes every incoming
character when it is in monitor mode. A valid character transmitted from the PC is
echoed once by the loopback circuitry on the board and once by the monitor of the
target processor itself. This status indicates whether or not the second echoed
character from the monitor response was received when one of the security bytes was
transmitted. If the status is ‘N’, which indicates that the character was not received,
or not received properly, it is most likely due to one of the following reasons:
– The baud rate specified was incorrect.
– The part did not start the monitor mode security check on reset. Signals to force
monitor mode may be incorrect.
– No Power to the ICS.
If this status bit is ‘N’, you must correct this before analyzing the rest of the status
bits.
• 2 – Device echoed all security bytes:
To pass security, the software must send 8 security bytes to the processor. The
processor echoes each of these eight bytes twice. If all 8 bytes did not get the proper
two-byte echo, this flag reads ‘N’. Reasons for this include: