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參數資料
型號: MC68HC05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 44/160頁
文件大小: 783K
代理商: MC68HC05C9A
L
G
R
Resets
General Release Specification
MC68HC05C9A
Rev. 4.0
44
Resets
MOTOROLA
5.2 Introduction
The MCU can be reset four ways: by the initial power-on reset function,
by an active low input to the RESET pin, by the COP, or by the clock
monitor. A reset immediately stops the operation of the instruction being
executed, initializes some control bits, and loads the program counter
with a user-defined reset vector address.
Figure 5-1
is a block diagram
of the reset sources.
Figure 5-1. Reset Sources
5.3 Power-On Reset (POR)
A power-on-reset occurs when a positive transition is detected on V
DD
.
The power-on reset is strictly for power turn-on conditions and should
not be used to detect a drop in the power supply voltage. There is a 4064
internal processor clock cycle (t
cyc
) oscillator stabilization delay after the
oscillator becomes active. The RESET pin will output a logic zero during
the 4064-cycle delay. If the RESET pin is low after the end of this 4064-
cycle delay, the MCU will remain in the reset condition until RESET is
driven high externally.
V
DD
RESET
RESET
LATCH
POWER-ON RESET
D
INTERNAL CLOCK
R
RST
TO CPU AND
SUBSYSTEMS
Q
STOP
CLOCK MONITOR
COP WATCHDOG
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相關代理商/技術參數
參數描述
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