參數(shù)資料
型號： MC68HC705X4CDW
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS Microcontroller Unit
中文描述： 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝： PLASTIC, SOIC-28
文件頁數(shù)： 24/156頁
文件大?。?/td> 926K
代理商： MC68HC705X4CDW
Modes of Operation and Pin Descriptions
MC68HC05X4 Rev 1.0
24
Modes of Operation and Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
MDS/TCAP
(VPP)
During reset this pin is used as a mode select input (MDS) to determine
the operating mode. It also serves as the input capture (TCAP) pin for
the 16-bit programmable timer. In addition t s the EPROM programming
voltage input pin (VPP) for the MC68HC705X4 device.
OSC1/OSC2
These pins provide control input for an on-chip clock oscillator circuit. A
crystal, ceramic resonator or external clock signal connected to these
pins provides the oscillator clock. The oscillator frequency (f
OSC
) is
divided by 2 or by 10, chosen via a mask option, to provide the internal
bus frequency (f
OP
).
System clocks
The MCU and MCAN system clocks are obtained as shown in the
Figure 7
.
C rystal
The circuit shown in
Figure 8
(a) is recommended when using a crystal.
The internal oscillator is designed to interface with an AT-cut
parallel-resonant quartz crystal resonator in the frequency range
specified for fosc (refer to
DC electrical characteristics
). Use of an
external CMOS oscillator is recommended when crystals outside the
specified ranges are to be used. The crystal and components should be
mounted as close as possible to the input pins to minimise output
distortion and start-up stabilization time.
Figure 7. Oscillator block diagram
OSC1
f
osc
f
osc
/2
f
OP
MCU bus clock
MCAN module system clock
t
SCL
=
f
osc
2P
Divide by
2
Divide by
10 or 2
Prescaler (P)
12-modes
F
Freescale Semiconductor, Inc.
n
.
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