Modes Of Operation; Reduced Performance Mode - NXP Semiconductors MC9S08SU16 Reference Manual

RCOSC
Temperature
sense
VDD

14.5 Modes of operation

PMC supports two operating modes: the reduced performance mode (RPM) and the full
performance mode (FPM).

14.5.1 Reduced performance mode

When the MCU enters the Stop mode, PMC enters the reduced performance mode
(RPM). In this state, the performance of four regulators is reduced but it allows an
external logic input to wake up the PMC. When in RPM, the four internal regulators have
some limitations as follows:
• VREG voltage accuracy is not guaranteed to be 5 V and its drive capability is
VDDX
reduced.
• VREG output voltage drops and its drive capability is very limited.
VDDF
• VREG output voltage drops and its drive capability is very limited.
VDD
• VREG is off.
VREFH
When in RPM, the low voltage detection system, the high-accuracy reference voltage and
the temperature sensor are off.
NXP Semiconductors
VREG
VREG
VDDF
Charge
pump
VREG
VREG
VDDX
Figure 14-1. Simplified PMC block diagram
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 14 Power Management Controller (PMC)
VDD
3 V
HCBG
3V
VDDX
IREFS
Control &
reference
VDD1.8
VDDF
VHCBG
VREFH
VREG
VREFH
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