参数资料
型号: XC68HC705X4DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 86/168页
文件大小: 656K
代理商: XC68HC705X4DW
Modes of Operation and Pin Descriptions
MC68HC05X4 Rev 1.0
24
Modes of Operation and Pin Descriptions
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 it is 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 (fOSC) is
divided by 2 or by 10, chosen via a mask option, to provide the internal
bus frequency (fOP).
System clocks
The MCU and MCAN system clocks are obtained as shown in the
Figure 7.
Crystal
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
fosc
fosc/2
fOP
MCU bus clock
MCAN module system clock
tSCL =
fosc
2P
Divide by
2
Divide by
10 or 2
Prescaler (P)
12-modes
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