MC9S12T64 Datasheet, PDF (182/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Voltage Regulator (VREG)
Normal Operation
Run Mode
In run mode, both regulating loops of the voltage regulator are active.
This mode is selected whenever the CPU is neither in stop mode nor in
pseudo stop mode, and VREGEN is externally connected to VDDA.
Special Operation
Standby Mode
Standby mode is selected when the CPU is in stop mode or in pseudo
stop mode, and VREGEN is externally connected to VDDA. In standby
mode, the gates of the power transistors are directly connected to the
reference voltage V_REF ((VDDA - VSSA)/2), the loop amplifiers are
switched off. In this case, the voltage regulator acts as a voltage clamp.
In standby mode, the source resistance of the regulator is increased, but
power consumption is significantly decreased.
Shutdown Mode
Shutdown mode can be selected by connecting VREGEN to VSSA. In
this case, VDD and VDDPLL (2.5V 10%)must be supplied externally. In
shutdown mode, VREG will also generate the power on reset signal.
MC9S12T64Revision 1.1.1
Voltage Regulator (VREG)
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