M 6 8 E V B 9 0 8 Q L 4
1 2 / 0 4 / 0 3
MON08 DEBUG PORT
The DEBUG port provides standard 9 pin connection with RS232 type serial interface to the
HC08 MON08 debug monitor. The MON_EN and CLK_EN options should be installed prior to
applying power to the EVB to apply the DEBUG port. HC08 ports PTA0, PTA2, and PTA5 are
applied to operate this port. Monitor communication is provided without additional features
such as BREAK or RESET. Hosting software is required to communicate with the monitor on
this port. Do not apply the DEBUG port and CYCLONE cable at the same time. Refer to the
M68EVB908QL4 schematic drawing for circuit and connector connections.
MON_EN Option
The MON_EN 1 and 2 option jumpers provide HC08 MON08 signals to the DEBUG Port.
Install the jumpers on both pins to enable the signals.
MON_EN 1 – Enables the 9V VTT supply to HC08 port PTA2/IRQ to enable monitor mode on
power up.
MON_EN 2 – Enables the MON08 communication from HC08 port PTA0 to the DEBUG port.
CLK_EN Option
The CLK_EN option jumper provides for a 9.8304Mhz clock to be applied to the HC08
PTA5/OSC1 pin. This clock source is required for MON08 debug monitor operation via the
DEBUG port. Install the jumper on both pins to enable the 9.8304 clock signal to the HC08.
X1 CLOCK OSCILLATOR
The X1 clock Oscillator is provided to allow default monitor mode (MON08) operation. When
the MON08 debug monitor is to be applied, the X1 clock should be optioned to provide the
clock source. The CLK_EN option jumper installed will provide the X1 clock source to the
HC08 device pin PTA5. User should also note that the MCU_PORT may provide a signal to
drive the clock signal on PTA5. In this case, the CLK_EN option should not be installed.
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