MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 71

• Manufacturer Part Number: MC68HC705J
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

4.3.1 Power-On Reset
MC68HC705J1A — Rev. 4.0
MOTOROLA
NOTE:
A positive transition on the V
The power-on reset is strictly for power-up conditions and cannot be
used to detect drops in power supply voltage.
A 4064-t
active allows the clock generator to stabilize. If any reset source is active
at the end of this delay, the MCU remains in the reset condition until all
reset sources are inactive.
ADDRESS BUS
Notes:
2. Internal clock, internal address bus, and internal data bus are not available externally.
1. Power-on reset threshold is typically between 1 V and 2 V.
INTERNAL
INTERNAL
INTERNAL
OSC1 PIN
DATA BUS
CLOCK
V
DD
cyc
(NOTE 1)
(internal clock cycle) delay after the oscillator becomes
Resets and Interrupts
Figure 4-2. Power-On Reset Timing
$07FE
OSCILLATOR STABILIZATION DELAY
DD
$07FE
pin generates a power-on reset.
$07FE
$07FE
$07FE
Resets and Interrupts
$07FE
NEW PCH NEW PCL
Technical Data
$07FF
Resets
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