參數(shù)資料
型號： MC68HC705E6
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 19/140頁
文件大?。?/td> 788K
代理商： MC68HC705E6
Modes of Operation and Pin Descriptions
Pin descriptions
MC68HC05E6 — Rev. 1.0
Modes of Operation and Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
7-pin
C eramic
resonator
A ceramic resonator may be used instead of a crystal in cost sensitive
applications. The circuit shown in
Figure 5
(a) is recommended when
using either a crystal or a ceramic resonator.
Figure 5
(e) lists the
recommended capacitance and feedback resistance values. The
manufacturer of the particular ceramic resonator being considered
should be consulted for specific information.
External clock
An external clock should be applied to the OSC1 input, with the OSC2
pin left unconnected, as shown in
Figure 5
(c). The t
(see
Table 23
) does not apply when using an external clock input. The
equivalent specification of the external clock source should be used in
lieu of t
OCOV
.
OCOV
specification
LVI
This active low input pin is used to indicate a drop in supply voltage
below a useful operating level. Driving this pin low initiates either a
pre-defined software routine or a hardware interrupt (see
Low voltage
indicator interrupt
). The LVI pin contains an internal Schmitt trigger to
improve noise immunity.
RESET
This active low input-only pin is used to reset the MCU. Applying a logic
zero to this pin forces the device to a known start-up state. The RESET
pin has an internal Schmitt trigger to improve noise immunity.
PA0DPA7
These eight I/O lines comprise port A. The state of any pin is software
programmable, and all the pins are configured as inputs with fixed
pull-up resistors during power-on or reset.
PB0DPB7
These eight pins comprise port B. The state of any pin is software
programmable, and all the pins are configured as inputs with fixed
pull-down resistors during power-on or reset.
NOTE:
PB5–PB7 are not bonded out in the 28-pin package.
F
Freescale Semiconductor, Inc.
n
.
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