mc68hc11d0cfn2 Freescale Semiconductor, Inc, mc68hc11d0cfn2 Datasheet - Page 51

• Manufacturer Part Number: mc68hc11d0cfn2
• Description: M68hc11 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

4.1 Introduction
4.2 Resets
4.2.1 RESET Pin
4.2.2 Power-On Reset (POR)
MC68HC711D3 — Rev. 2
MOTOROLA
Data Sheet — MC68HC711D3
This section describes the internal and external resets and interrupts of the
MC68HC711D3 and its two low power-consumption modes.
The microcontroller unit (MCU) can be reset in any of these four ways:
The RESET input consists mainly of a Schmitt trigger that senses the RESET line
logic level.
To request an external reset, the RESET pin must be held low for at least eight
E-clock cycles, or for one E-clock cycle if no distinction is needed between internal
and external resets.
Power-on reset occurs when a positive transition is detected on V
used strictly for power turn on conditions and should not be used to detect any drop
in the power supply voltage. If the external RESET pin is low at the end of the
power-on delay time, the processor remains in the reset condition until RESET
goes high.
1. An active-low input to the RESET pin
2. A power-on reset (POR) function
3. A clock monitor failure
4. A computer operating properly (COP) watchdog timer timeout
Freescale Semiconductor, Inc.
Section 4. Resets, Interrupts, and Low-Power Modes
For More Information On This Product,
Resets, Interrupts, and Low-Power Modes
Go to: www.freescale.com
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. This reset is
Data Sheet
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