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参数资料
型号： MC68HC05V7FN
厂商： MOTOROLA INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封装： PLASTIC, LCC-68
文件页数： 87/170页
文件大小： 589K
代理商： MC68HC05V7FN
SECTION 1: GENERAL DESCRIPTION
MOTOROLA
Page 9
MC68HC05V7 Specification Rev. 1.0
1.5
FUNCTIONAL PIN DESCRIPTION
The following paragraphs give a description of the general function of each pin.
1.5.1
VBATT
Power is supplied to the device through the VBATT pin. The on-chip voltage regulator uses
this voltage to derive the internal VDD supply for the MCU. The VBATT pin is also used to
power the MDLC and should still be connected even when the Voltage Regulator is not
used. See SECTION 7 POWER SUPPLY AND REGULATION.
1.5.2
VDD AND VSS
These pins are provided to allow the internally generated VDD supply to be externally
decoupled. The short rise and fall times of the MCU supply current transients place very
high short-duration current demands on the internal power supply. To prevent noise
problems, special care should be taken to provide good power supply bypassing at the
MCU by using bypass capacitors with good high-frequency characteristics that are
positioned as close to the MCU supply pins as possible. Two sets of VDD and VSS pins are
required to maintain on-chip supply noise to within acceptable limits. Each supply pin pair
will require its own decoupling capacitor. See SECTION 7
POWER SUPPLY AND
REGULATION.
1.5.3
VSSA1
VSSA1 is a separate ground pad, which provides a ground return for the A/D subsystem. To
prevent digital noise contamination, this pin should be connected directly to a low
impedance ground reference point.
1.5.4
VSSA2
VSSA2 is a separate ground pad, which provides a ground return for the MDLC analog
subsystem. To prevent digital noise contamination, this pin should be connected directly to
a low impedance ground reference point.
1.5.5
VCCA
VCCA is a separate supply pin providing power to the analog subsystems of the MDLC and
A/D converter. This pin should be connected to the VDD pin externally. To prevent
contamination from the digital supply, this pin should be adequately decoupled to a low
impedance ground reference. See SECTION 7 POWER SUPPLY AND REGULATION.
1.5.6
VREFH AND VREFL
VREFH is the positive (high) reference voltage for the A/D subsystem. VREFL is the negative
(low) reference voltage for the A/D subsystem. VREFH and VREFL should be isolated from
the digital supplies to prevent any loss of accuracy from the A/D converter.
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