MC9S08GT16A Datasheet, PDF (78/300 Pages) Freescale Semiconductor, Inc – Microcontrollers

Resets, Interrupts, and System Configuration
5.7.8 System Power Management Status and Control 2 Register (SPMSC2)
This register is used to report the status of the low voltage warning function, and to configure the stop mode
behavior of the MCU.
R
W
Power-on
reset:
LVD reset:
Any other
reset:
7
LVWF
0
Note ⁽¹⁾
0
Note ⁽¹⁾
0
Note ⁽¹⁾
6
0
LVWACK
0
5
LVDV
0
4
LVWV
0
0
U
U
0
U
U
= Unimplemented or Reserved
3
PPDF
0
2
0
PPDACK
0
0
0
0
0
U = Unaffected by reset
1
PDC
0
0
0
0
PPDC
0
0
0
1 _{LVWF will be set in the case when VSupply transitions below the trip point or after reset and VSupply is already below VLVW.}
Figure 5-10. System Power Management Status and Control 2 Register (SPMSC2)
Table 5-11. SPMSC2 Field Descriptions
Field
Description
7
LVWF
6
LVWACK
5
LVDV
4
LVWV
3
PPDF
2
PPDACK
1
PDC
0
PPDC
Low-Voltage Warning Flag — The LVWF bit indicates the low voltage warning status.
0 Low voltage warning not present.
1 Low voltage warning is present or was present.
Low-Voltage Warning Acknowledge — The LVWACK bit is the low-voltage warning acknowledge. Writing a 1
to LVWACK clears LVWF to 0 if a low voltage warning is not present.
Low-Voltage Detect Voltage Select — The LVDV bit selects the LVD trip point voltage (V_LVD).
0 Low trip point selected (V_LVD = V_LVDL).
1 High trip point selected (V_LVD = V_LVDH).
Low-Voltage Warning Voltage Select — The LVWV bit selects the LVW trip point voltage (V_LVW).
0 Low trip point selected (V_LVW = V_LVWL).
1 High trip point selected (V_LVW = V_LVWH).
Partial Power Down Flag — The PPDF bit indicates that the MCU has exited the stop2 mode.
0 Not stop2 mode recovery.
1 Stop2 mode recovery.
Partial Power Down Acknowledge — Writing a 1 to PPDACK clears the PPDF bit.
Power Down Control — The write-once PDC bit controls entry into the power down (stop2 and stop1) modes.
0 Power down modes are disabled.
1 Power down modes are enabled.
Partial Power Down Control — The write-once PPDC bit controls which power down mode, stop1 or stop2, is
selected.
0 Stop1, full power down, mode enabled if PDC set.
1 Stop2, partial power down, mode enabled if PDC set.
MC9S08GT16A/GT8A Data Sheet, Rev. 1
78
Freescale Semiconductor