S912XHY128F0VLM Datasheet, PDF (304/802 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Voltage Regulator (S12VREGL3V3V1)
9.3.2.2 Control Register (VREGCTRL)
The VREGCTRL register allows the configuration of the VREG_3V3 low-voltage detect features.
0x02F1
7
6
5
4
R
0
0
0
0
W
Reset
0
0
0
0
= Unimplemented or Reserved
3
2
1
0
0
LVDS
LVIE
LVIF
0
0
0
0
Figure 9-2. Control Register (VREGCTRL)
Table 9-5. VREGCTRL Field Descriptions
Field
2
LVDS
1
LVIE
0
LVIF
Description
Low-Voltage Detect Status Bit — This read-only status bit reflects the input voltage. Writes have no effect.
0 Input voltage V_DDA is above level V_LVID or RPM or shutdown mode.
1 Input voltage V_DDA is below level V_LVIA and FPM.
Low-Voltage Interrupt Enable Bit
0 Interrupt request is disabled.
1 Interrupt will be requested whenever LVIF is set.
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.
Note: On entering the Reduced Power Mode the LVIF is not cleared by the VREG_3V3.
MC9S12XHY-Family Reference Manual, Rev. 1.01
304
Freescale Semiconductor