参数资料
型号: MC68HC705C9ACS
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER
文件页数: 132/177页
文件大小: 1941K
代理商: MC68HC705C9ACS
Resets
Advance Information
MC68HC705C9A — Rev. 4.0
58
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 VDD.
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 (tcyc) oscillator stabilization delay after the
oscillator becomes active. (When configured as a C9A, the RESET pin
will output a logic 0 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.
VDD
RESET
LATCH
POWER-ON RESET
D
INTERNAL CLOCK
R
RST
TO CPU AND
SUBSYSTEMS
Q
STOP
CLOCK MONITOR
COP WATCHDOG
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