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APPENDIX A – TECHNICAL REFERENCE & TROUBLESHOOTING
8. Make sure that external circuitry does not interfere with the monitor
9. When connecting to a target system, observe the setting of W3 (target
A.4 TROUBLESHOOTING MON08 MODE
This section describes the troubleshooting steps for the instances where the
MCU is installed on a target system and the ICS08AB is used to interact with
the target system through the MON08 cable. These instances include in-circuit
simulation/emulation and FLASH memory programming through the MON08
cable.
1. Disconnect the target system and make sure that the ICS08AB operates
2. If the quick start works, the ICS08AB should be functioning well
3. Prepare the ICS08AB for use with the MON08 cable. Turn off the
A-8
and PTC3 are connected to the target connector pins after the rising
edge of RST* and are then available for target system connections.
The MCU's PTA0 pin is never connected to the target pins, as it is
used for host communication.
c. IRQ* must remain at 8.0 Vdc to hold the MCU in monitor mode.
The ICS08AB board has an interrupt lockout feature to keep IRQ*
at 8.0 Vdc when the RST* or RST_IN* signal is asserted (low)
and keep it at 8.0 Vdc until after RST* goes high. The TGT_IRQ*
signal is allowed to control the IRQ* signal when RST* is not
asserted.
mode communications. When connecting external circuitry to the
ICS08AB board, use only the target system connectors J1 and J2.
This ensures that the target system will not interfere with the communi-
cations and setup of the MCU's monitor mode by allowing the
ICS08AB to disconnect some target system components during moni-
tor mode entry.
RST* direction). W3 is provided to allow you to select whether the tar-
get system can reset the MCU on the ICS08AB (jumper between pins 1
and 2) or whether the target system receives a reset signal from the
ICS08AB (jumper between pins 2 and 3). RST* is not a bidirectional,
open-drain signal at the target connectors. Removing the jumper leaves
the RST_IN* signal pulled up to 5 Vdc.
correctly when configured as described in the quick start instructions
(Section 1.6 HARDWARE QUICK START INSTRUCTIONS).
Refer to Section A.3 TROUBLESHOOTING THE QUICK START
if you have trouble getting the quick start to work.
enough to place the MCU on the target system into monitor mode.
power to the target system. Exit the ICS08AB software. Remove the
M68ICS08ABUM/D
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