MC68HC05K1 FREESCALE [Freescale Semiconductor, Inc], MC68HC05K1 Datasheet - Page 54

• Manufacturer Part Number: MC68HC05K1
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Technical Data
5.3 Reset Types
5.3.1 Power-On Reset
Technical Data
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.
These conditions produce a reset:
Figure 5-1
A positive transition on the V
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 a
logic 0 at the end of 4064 t
until the signal on the RESET pin goes to a logic 1.
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Initial power-up (power-on reset)
A logic 0 applied to the RESET pin (external reset)
Timeout of the mask-optional computer operating properly (COP)
watchdog (COP reset)
An opcode fetch from an address not in the read-only memory
(ROM) or random-access memory (RAM) (illegal address reset)
V
reset)
DD
cyc
voltage below LVR trip point (mask-optional low-voltage
is a block diagram of the reset sources.
(internal clock cycle) delay after the oscillator becomes
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Resets
cyc
DD
, the MCU remains in the reset condition
pin generates a power-on reset. The
MC68HC05K0 • MC68HC05K1 — Rev. 2.0