參數(shù)資料
型號： MC68HC912BL16VFU8
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝： QFP-64
文件頁數(shù)： 2/128頁
文件大?。?/td> 532K
代理商： MC68HC912BL16VFU8
MOTOROLA
MC68HC912BL16
10
MC68HC912BL16TS/D
3.2 Power Supply Pins
MC68HC912BL16 power and ground pins are described below and summarized in Table 4.
3.2.1 Internal Power (VDD) and Ground (VSS)
Power is supplied to the MCU through VDD and VSS. Because fast signal transitions place high, short-
duration current demands on the power supply, use bypass capacitors with high-frequency character-
istics and place them as close to the MCU as possible. Bypass requirements depend on how heavily
the MCU pins are loaded.
3.2.2 External Power (VDDX) and Ground (VSSX)
External power and ground for I/O drivers. Because fast signal transitions place high, short-duration cur-
rent demands on the power supply, use bypass capacitors with high-frequency characteristics and
place them as close to the MCU as possible. Bypass requirements depend on how heavily the MCU
pins are loaded.
3.2.3 VDDA, VSSA
Provides operating voltage and ground for the analog-to-digital converter. This allows the supply volt-
age to the A/D to be bypassed independently.
3.2.4 Analog-to-Digital Reference Voltages (VRH, VRL)
3.2.5 VFP
Flash EEPROM programming voltage and supply voltage during normal operation.
3.3 Signal Descriptions
3.3.1 Crystal Driver and External Clock Input (XTAL, EXTAL)
These pins provide the interface for either a crystal or a CMOS compatible clock to control the internal
clock generator circuitry. Out of reset the frequency applied to EXTAL is twice the desired E-clock rate.
All the device clocks are derived from the EXTAL input frequency.
Table 4 MC68HC912BL16 Power and Ground Connection Summary
Mnemonic
Pin Number
Description
VDD
38
Internal power and ground.
VSS
39
VDDX
22, 60
External power and ground, supply to pin drivers.
VSSX
21, 59
VDDA
50
Operating voltage and ground for the analog-to-digital converter,
allows the supply voltage to the A/D to be bypassed independently.
VSSA
51
VRH
40
Reference voltages for the analog-to-digital converter.
VRL
41
VFP
58
Programming voltage for the Flash EEPROM and required supply
for normal operation.
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