Datasheet

S12 Clock, Reset and Power Management Unit (S12CPMU)
MC9S12G Family Reference Manual, Rev.1.23
390 Freescale Semiconductor
10.3.2.13 Low Voltage Control Register (CPMULVCTL)
The CPMULVCTL register allows the configuration of the low-voltage detect features.
Read: Anytime
Write: LVIE and LVIF are write anytime, LVDS is read only
0x02F1
76543210
R00000LVDS
LVIE LVIF
W
Reset 00000U0U
The Reset state of LVDS and LVIF depends on the external supplied VDDA level
= Unimplemented or Reserved
Figure 10-16. Low Voltage Control Register (CPMULVCTL)
Table 10-15. CPMULVCTL Field Descriptions
Field Description
2
LVDS
Low-Voltage Detect Status Bit — This read-only status bit reflects the voltage level on VDDA. Writes have no
effect.
0 Input voltage VDDA is above level V
LVID
or RPM.
1 Input voltage VDDA is below level V
LVIA
and FPM.
1
LVIE
Low-Voltage Interrupt Enable Bit
0 Interrupt request is disabled.
1 Interrupt will be requested whenever LVIF is set.
0
LVIF
Low-Voltage Interrupt Flag — LVIF is set to 1 when LVDS status bit changes. This flag can only be cleared by
writing a 1. Writing a 0 has no effect. If enabled (LVIE = 1), LVIF causes an interrupt request.
0 No change in LVDS bit.
1 LVDS bit has changed.