MC68HC908AP16CFA MOTOROLA [Motorola, Inc], MC68HC908AP16CFA Datasheet - Page 158

• Manufacturer Part Number: MC68HC908AP16CFA
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Monitor ROM (MON)
Data Sheet
158
NOTE:
If the reset vector is blank and monitor mode is entered, the chip will see
an additional reset cycle after the initial POR reset. Once the part has
been programmed, the traditional method of applying a voltage, V
IRQ1 must be used to enter monitor mode.
The COP module is disabled in monitor mode based on these
conditions:
The second condition states that as long as V
IRQ1 pin after entering monitor mode, or if V
the initial reset to get into monitor mode (when V
IRQ1), then the COP will be disabled. In the latter situation, after V
applied to the RST pin, V
interest of freeing the IRQ1 for normal functionality in monitor mode.
Figure 10-2
the reset vector is blank and just V
An external oscillator of 9.8304 MHz is required for a baud rate of 9600,
as the internal bus frequency is automatically set to the external
frequency divided by four.
Enter monitor mode with pin configuration shown in
pulling RST low and then high. The rising edge of RST latches monitor
mode. Once monitor mode is latched, the values on the specified pins
can change.
Once out of reset, the MCU waits for the host to send eight security
bytes. (See
break signal (10 consecutive logic 0’s) to the host, indicating that it is
ready to receive a command.
Freescale Semiconductor, Inc.
•
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For More Information On This Product,
If monitor mode was entered as a result of the reset vector being
blank (above condition set 2 or 3), the COP is always disabled
regardless of the state of IRQ1 or RST.
If monitor mode was entered with V
then the COP is disabled as long as V
or RST.
10.4
Go to: www.freescale.com
shows a simplified diagram of the monitor mode entry when
Security.) After the security bytes, the MCU sends a
TST
can be removed from the IRQ1 pin in the
DD
voltage is applied to the IRQ1 pin.
TST
MC68HC908AP Family — Rev. 2.5
TST
TST
on IRQ1 (condition set 1),
TST
is applied to either IRQ1
is applied to RST after
TST
is maintained on the
Figure 10-1
was applied to
MOTOROLA
TST
by
TST
, to
is