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参数资料
型号： MC9S12DJ256MPVE
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
封装： LQFP-112
文件页数： 97/132页
文件大小： 782K
代理商： MC9S12DJ256MPVE
MC9S12DT256 Device User Guide — V03.07
67
2.4.3 VDD1, VDD2, VSS1, VSS2 — Core Power Pins
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
characteristics and place them as close to the MCU as possible. This 2.5V supply is derived from the
internal voltage regulator. There is no static load on those pins allowed. The internal voltage regulator is
turned off, if VREGEN is tied to ground.
NOTE:
No load allowed except for bypass capacitors.
2.4.4 VDDA, VSSA — Power Supply Pins for ATD and VREG
VDDA, VSSA are the power supply and ground input pins for the voltage regulator and the analog to
digital converter. It also provides the reference for the internal voltage regulator. This allows the supply
voltage to the ATD and the reference voltage to be bypassed independently.
2.4.5 VRH, VRL — ATD Reference Voltage Input Pins
VRH and VRL are the reference voltage input pins for the analog to digital converter.
2.4.6 VDDPLL, VSSPLL — Power Supply Pins for PLL
Provides operating voltage and ground for the Oscillator and the Phased-Locked Loop. This allows the
supply voltage to the Oscillator and PLL to be bypassed independently.This 2.5V voltage is generated by
the internal voltage regulator.
NOTE:
No load allowed except for bypass capacitors.
Table 2-2 MC9S12DP256 Power and Ground Connection Summary
Mnemonic
Pin Number Nominal
Voltage
Description
112-pin QFP
VDD1, 2
13, 65
2.5 V
Internal power and ground generated by internal regulator
VSS1, 2
14, 66
0V
VDDR
41
5.0 V
External power and ground, supply to pin drivers and internal
voltage regulator.
VSSR
40
0 V
VDDX
107
5.0 V
External power and ground, supply to pin drivers.
VSSX
106
0 V
VDDA
83
5.0 V
Operating voltage and ground for the analog-to-digital
converters and the reference for the internal voltage regulator,
allows the supply voltage to the A/D to be bypassed
independently.
VSSA
86
0 V
VRL
85
0 V
Reference voltages for the analog-to-digital converter.
VRH
84
5.0 V
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