MC9S08SG8 Datasheet, PDF (72/310 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 5 Resets, Interrupts, and General System Control
5.7.7 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.
7
R
0
W
6
5
4
0
LVDV¹
LVWV
Power-on Reset:
0
0
0
0
LVD Reset:
0
0
u
u
Any other Reset:
0
0
u
u
= Unimplemented or Reserved
3
PPDF
0
0
0
2
1
0
0
PPDACK
0
0
0
0
0
0
u = Unaffected by reset
0
PPDC²
0
0
0
1 _{This bit can be written only one time after power-on reset. Additional writes are ignored.}
2 _{This bit can be written only one time after reset. Additional writes are ignored.}
Figure 5-9. System Power Management Status and Control 2 Register (SPMSC2)
Table 5-10. SPMSC2 Register Field Descriptions
Field
Description
5
LVDV
4
LVWV
3
PPDF
2
PPDACK
0
PPDC
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 Table 5-11.
Low-Voltage Warning Voltage Select — This bit selects the low voltage warning (LVW) trip point voltage. See
Table 5-11.
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.
Table 5-11. LVD and LVW trip point typical values¹
LVDV:LVWV
LVW Trip Point
LVD Trip Point
0:0
V_LVW0 = 2.74 V
V_LVD0 = 2.56 V
0:1
V_LVW1 = 2.92 V
1:0
V_LVW2 = 4.3 V
V_LVD1 = 4.0 V
1:1
V_LVW3 = 4.6 V
1 _{See Electrical Characteristics appendix for minimum and maximum values.}
MC9S08SG8 MCU Series Data Sheet, Rev. 0
72
PRELIMINARY
Freescale Semiconductor