mc9s08sg4 Freescale Semiconductor, Inc, mc9s08sg4 Datasheet - Page 72

• Manufacturer Part Number: mc9s08sg4
• Description: 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

Chapter 5 Resets, Interrupts, and General System Control
5.7.7
This register is used to report the status of the low voltage warning function, and to configure the stop mode
behavior of the MCU.
72
1
2
Any other Reset:
Power-on Reset:
PPDACK
This bit can be written only one time after power-on reset. Additional writes are ignored.
This bit can be written only one time after reset. Additional writes are ignored.
PPDC
LVWV
PPDF
Field
LVDV
LVD Reset:
5
4
3
2
0
System Power Management Status and Control 2 Register
(SPMSC2)
Low-Voltage Detect Voltage Select — This write-once bit selects the low voltage detect (LVD) trip point setting.
It also selects the warning voltage range. See
Low-Voltage Warning Voltage Select — This bit selects the low voltage warning (LVW) trip point voltage. See
Table
Partial Power Down Flag — This read-only status bit indicates that the MCU has recovered from stop2 mode.
0 MCU has not recovered from stop2 mode.
1 MCU recovered from stop2 mode.
Partial Power Down Acknowledge — Writing a 1 to PPDACK clears the PPDF bit
Partial Power Down Control — This write-once bit controls whether stop2 or stop3 mode is selected.
0 Stop3 mode enabled.
1 Stop2, partial power down, mode enabled.
Figure 5-9. System Power Management Status and Control 2 Register (SPMSC2)
W
R
1
5-11.
See Electrical Characteristics appendix for minimum and maximum values.
0
7
0
0
0
LVDV:LVWV
0:0
0:1
1:0
1:1
= Unimplemented or Reserved
Table 5-11. LVD and LVW trip point typical values
Table 5-10. SPMSC2 Register Field Descriptions
0
0
0
0
6
MC9S08SG8 MCU Series Data Sheet, Rev. 3
LVDV
0
u
u
5
LVW Trip Point
V
V
V
V
LVW0
LVW1
1
LVW2
LVW3
= 2.74 V
= 2.92 V
= 4.3 V
= 4.6 V
LVWV
Table
u
4
0
u
Description
5-11.
PPDF
0
0
0
3
LVD Trip Point
V
V
LVD0
LVD1
PPDACK
u = Unaffected by reset
= 2.56 V
= 4.0 V
0
0
0
0
2
1
Freescale Semiconductor
0
0
0
0
1
PPDC
0
0
0
0
2