MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 66

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Resets and Interrupts
5.2 Resets
5.2.1 Power-On Reset
Technical Data
66
NOTE:
A reset immediately stops the operation of the instruction being
executed, initializes certain control bits, and loads the program counter
with a user-defined reset vector address. The following sources can
generate resets:
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 the RESET pin is at logic
zero at the end of 4064 t
the signal on the RESET pin goes to logic one.
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•
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Freescale Semiconductor, Inc.
For More Information On This Product,
Power-on reset (POR) circuit
RESET pin
COP watchdog
RESET
CYC
V
DD
(internal clock cycle) delay after the oscillator becomes
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Resets and Interrupts
(PROGRAMMABLE OPTION)
POWER-ON RESET
COP WATCHDOG
Figure 5-1. Reset Sources
CYC
, the MCU remains in the reset condition until
DD
INTERNAL CLOCK
pin generates a power-on reset.
MC68HC705P9 — Rev. 4.0
D
CK
RESET
LATCH
S
Q
RST
MOTOROLA
TO CPU AND
SUBSYSTEMS