Application Note
AN1060 — Rev. 1.0
MOTOROLA
225
without resulting in output driver conflicts. It may be important to
consider what the existing logic will do with the SCI serial data instead of
the signals that would have been produced by the PD0 pin. In systems
where the PD0 pin is used normally as a general-purpose input, the
driver circuit that drives the PD0 pin must be designed so that the serial
data can override this driver, or the driver must be disconnected during
the bootstrap download. A simple series resistor between the driver and
the PD0 pin solves this problem as shown in
Figure 5
. The serial data
from the host computer can then be connected to the PD0/RxD pin, and
the series resistor will prevent direct conflict between the host driver and
the normal PD0 driver.
Figure 5. Preventing Driver Conflict
TxD Pin
The bootloader program uses the PD1/TxD pin to send verification data
back to the host computer. To minimize the possibility of conflicts with
circuitry connected to this pin, port D is configured for wire-OR mode by
the bootloader program during initialization. Since the wire-OR
configuration prevents the pin from driving active high levels, a pullup
resistor to V
DD
is needed if the TxD signal is used.
In systems where the PD1/TxD pin is normally used as a general-
purpose output, there are no output driver conflicts. It may be important
to consider what the existing logic will do with the SCI serial data instead
of the signals that would have been produced by the PD1 pin.
In systems where the PD1 pin is normally used as a general-purpose
input, the driver circuit that drives the PD1 pin must be designed so that
the PD1/TxD pin driver in the MCU can override this driver. A simple
series resistor between the driver and the PD1 pin can solve this
problem. The TxD pin can then be configured as an output, and the
RxD/PD0
(BEING USED
AS INPUT)
EXISTING
CONTROL
SIGNAL
SERIES
RESISTOR
RS232
LEVEL
SHIFTER
FROM
HOST
SYSTEM
MC68HC11
EXISTING
DRIVER
CONNECTED ONLY DURING
BOOTLOADING
F
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n
.