參數(shù)資料
型號: MC68HC05E5DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 76/140頁
文件大?。?/td> 847K
代理商: MC68HC05E5DW
NON-DISCLOSURE
AGREEMENT
REQUIRED
Resets
General Release Specification
MC68HC05E5 Rev. 1.0
40
Resets
MOTOROLA
5.3 External Reset (RESET)
The RESET pin is the only external source of a reset. This pin is
connected to a Schmitt trigger input gate to provide an upper and lower
threshold voltage separated by a minimum amount of hysteresis. This
external reset occurs whenever the RESET pin is pulled below the lower
threshold and remains in reset until the RESET pin rises above the
upper threshold. This active-low input will generate the RST signal and
reset the CPU and peripherals. The only reset sources that can alter the
MCU’s operating mode are termination of the external reset input or the
internal computer operating properly (COP) watchdog reset.
NOTE:
Activation of the RST signal is generally referred to as a reset of the
device, unless otherwise specified.
Figure 5-1. Reset Block Diagram
CPU
LATCH
RESET
COP WATCHDOG
(COPR)
RST
OSC
DATA
ADDRESS
PH2
TO OTHER
PERIPHERALS
S
IRQ/VTST
MODE
SELECT
TO IRQ
LOGIC
LATCH
R
POWER-ON RESET
(POR)
VDD
ILLEGAL ADDRESS
(ILLADDR)
ADDRESS
PH2
CLOCKED
ONE-SHOT
(PULSE WIDTH = 3 x E-CLK)
D
DISABLED STOP
INSTRUCTION
STOPEN
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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