MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 194

• Manufacturer Part Number: MC68HC908GR4
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Monitor ROM (MON)
Technical Data
194
NOTE:
requirements and conditions, are not in effect. This is to reduce circuit
requirements when performing in-circuit programming.
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
IRQ 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
IRQ pin after entering monitor mode, or if V
the initial reset to get into monitor mode (when V
then the COP will be disabled. In the latter situation, after V
to the RST pin, V
freeing the IRQ for normal functionality in monitor mode.
Figure 15-2
the reset vector is blank and just 1 x V
pin. 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.
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 (condition set 2 or 3), the COP is always disabled regardless
of the state of IRQ or RST.
If monitor mode was entered with V
then the COP is disabled as long as V
or RST.
shows a simplified diagram of the monitor mode entry when
Go to: www.freescale.com
Monitor ROM (MON)
TST
can be removed from the IRQ pin in the interest of
DD
TST
voltage is applied to the IRQ
TST
TST
on IRQ (condition set 1),
TST
TST
MC68HC908GR8 — Rev 4.0
is applied to RST after
is applied to either IRQ
is maintained on the
was applied to IRQ),
TST
MOTOROLA
is applied
TST
, to