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MON08 Multilink User Manual
49
P&E
Microcomputer
Systems, Inc.
MON08 MULTILINK
analyzing the reset 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 should be 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:
1. The baud rate specified was incorrect.
2. The part did not start the monitor mode security check on reset.
Signals to force monitor mode may be incorrect.
3. No Power to the ICS.
If this status bit responded with an ‘N’, you must correct this before
analyzing the reset of the status bits.
2 – Device echoed all security bytes:
In order to pass security, the software must send 8 security bytes to the
processor. The processor should echo each of these eight bytes twice. If all
8 bytes did not get the proper two-byte echo, this flag will be ‘N’. Reasons
for this include:
1. The part did not start the monitor mode security check on reset.
Signals to force monitor mode may be incorrect.
2. The baud rate specified was incorrect.
3. The processor was not reset properly. Check the “Target Hardware
Type” and if you are connecting to a class II board, check the “MON08
cable communication connections type” in the “advanced settings”
dialog.
3 – Device signaled monitor mode with a break:
Once the processor has properly received the 8 bytes from the PC software
to complete its security check, it should transmit a break character to the
PC signaling entry into monitor mode. This break should be sent regardless
of whether the security check was successfully passed. If a break was not
received from the processor, this flag will be ‘N’. Reasons for this include:
1. The baud rate specified was incorrect.
2. The processor was not reset properly. Check the “Target Hardware