参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 105/157页
文件大小: 2252K
代理商: MCC68HC711D3
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Resets, Interrupts, and Low-Power Modes
51
Data Sheet — MC68HC711D3
Section 4. Resets, Interrupts, and Low-Power Modes
4.1 Introduction
This section describes the internal and external resets and interrupts of the
MC68HC711D3 and its two low power-consumption modes.
4.2 Resets
The microcontroller unit (MCU) can be reset in any of these four ways:
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
The RESET input consists mainly of a Schmitt trigger that senses the RESET line
logic level.
4.2.1 RESET Pin
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.
4.2.2 Power-On Reset (POR)
Power-on reset occurs when a positive transition is detected on VDD. This reset is
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.
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