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MC68HC705P9CS Datasheet(PDF) 66 Page - Freescale Semiconductor, Inc

Part # MC68HC705P9CS
Description  Microcontrollers
PDF  160 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS Datasheet(HTML) 66 Page - Freescale Semiconductor, Inc

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Resets and Interrupts
Technical Data
MC68HC705P9 — Rev. 4.0
66
Resets and Interrupts
MOTOROLA
5.2 Resets
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:
•
Power-on reset (POR) circuit
•
RESET pin
•
COP watchdog
Figure 5-1. Reset Sources
5.2.1 Power-On Reset
A positive transition on the VDD pin generates a power-on reset.
NOTE:
The power-on reset is strictly for power-up conditions and cannot be
used to detect drops in power supply voltage.
A 4064 t
CYC (internal clock cycle) delay after the oscillator becomes
active allows the clock generator to stabilize. If the RESET pin is at logic
zero at the end of 4064 t
CYC, the MCU remains in the reset condition until
the signal on the RESET pin goes to logic one.
DQ
CK
S
RESET
LATCH
POWER-ON RESET
COP WATCHDOG
(PROGRAMMABLE OPTION)
INTERNAL CLOCK
RST
TO CPU AND
RESET
V
DD
SUBSYSTEMS
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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