Motorola MC9S12DG128B, MC9S12DT128B, MC9S12DB128B VDDA, VSSA - Power Supply Pins for ATD and VREG

MC9S12DT128B Device User Guide — V01.07

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.

2.4.7 VREGEN — On Chip Voltage Regulator Enable

Enables the internal 5V to 2.5V voltage regulator. If this pin is tied low, VDD1,2 and VDDPLL must be supplied externally.

63

http://www.xinpian.net 提供单片机解密、IC解密、芯片解密业务 010-62245566 13810019655