參數(shù)資料
型號: MC68HC705J1Ac
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 30/162頁
文件大小: 1085K
代理商: MC68HC705J1AC
Technical Data
MC68HC705J1A — Rev. 4.0
General Description
General Description
1.5.2.3 RC Oscillator
Refer to
Appendix A. MC68HRC705J1A
and
Appendix C.
MC68HSR705J1A
.
1.5.2.4 External Clock
An external clock from another complementary metal-oxide
semiconductor (CMOS)-compatible device can be connected to the
OSC1 input, with the OSC2 input not connected, as shown in
Figure 1-8
. This configuration is possible regardless of whether the
crystal/ceramic resonator or the RC oscillator is enabled.
Figure 1-8. External Clock Connections
1.6 RESET
Applying a logic 0 to the RESET pin forces the MCU to a known startup
state. An internal reset also pulls the RESET pin low. An internal resistor
to V
DD
pulls the RESET pin high. A steering diode between the RESET
and V
DD
pins discharges any RESET pin voltage when power is
removed from the MCU. The RESET pin contains an internal Schmitt
trigger to improve its noise immunity as an input. Refer to
Section 4.
Resets and Interrupts
for more information.
MCU
EXTERNAL
CMOS CLOCK
O
O
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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