Functional Description; Voltage Regulators; Vregvddx; Vregvddf - NXP Semiconductors MC9S08SU16 Reference Manual

Field
7–3 This field is reserved.
Reserved This read-only field is reserved and always has the value 0.
2 High-accuracy Bandgap Ready flag
HBGRDY
0 Below 0.8 V, this bit is cleared.
1 Above 1 V, this bit is asserted.
1 This field is reserved.
Reserved This read-only field is reserved and always has the value 0.
0 VREFH Ready flag
VREFRDY
NOTE: Even after VREFRDY is set, it does not necessarily mean that VREF is okay for use instantly. It
0 Below 3.0 V, this bit is cleared.
1 Above 3.45 V, this bit is asserted.

14.8 Functional description

The following sections describe functional details of the module.

14.8.1 Voltage regulators

PMC integrates four voltage regulators: VREG
VREG . These four voltage regulators are the power supply for all on-chip modules.
VREFH
14.8.1.1 VREG
VDDX
VREG is a 5 V output regulator. It is the power supply for the digital I/Os domain
VDDX
(VDDX) and the analog modules domain (VDDA).
14.8.1.2 VREG
VDDF
VREG is a 2.8 V output regulator. It is the power supply for the on-chip NVM
VDDF
module (VDDF).
NXP Semiconductors
PMC_STAT field descriptions
needs to wait about 3 ms, in the chip power-on or stop mode, to wake up before using the VREF
for ADC.
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 14 Power Management Controller (PMC)
Description
, VREG , VREG
VDDX VDDF
and
VDD
229