参数资料
型号: M68HC05M68H
厂商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件页数: 41/130页
文件大小: 1541K
代理商: M68HC05M68H
MC68HC705P6A
Rev. 2.0
Advance Information
MOTOROLA
Resets
41
Advance Information
MC68HC705P6A
Section 4. Resets
4.1 Contents
4.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
4.3
External Reset (RESET). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
4.4
4.4.1
4.4.2
Internal Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Computer Operating Properly (COP) Reset. . . . . . . . . . . . .42
4.2 Introduction
The MCU can be reset from three sources: one external input and two
internal reset conditions. The RESET pin is a Schmitt trigger input as
shown in
Figure 4-1
. The CPU and all peripheral modules will be reset
by the RST signal which is the logical OR of internal reset functions and
is clocked by PH1.
Figure 4-1. Reset Block Diagram
D
RST
POWER-ON
RESET
(POR)
RESET
COP
WATCHDOG
(COPR)
V
DD
OSC
DATA
ADDRESS
DFF
TO CPU AND
PERIPHERALS
PH1
RES
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