MC9S08JM16 Datasheet, PDF (75/386 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 5 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. This register must be written during the user’s reset initialization program to
set the desired controls even if the desired settings are the same as the reset settings.
7
R
0
W
6
5
4
3
2
1
0
PPDF
0
0
LVDV
LVWV
PPDACK
Power-on Reset:
0
0
0
0
0
0
0
LVD Reset:
0
0
u
u
0
0
0
Any other Reset:
0
0
u
u
0
0
0
= Unimplemented or Reserved
u = Unaffected by reset
1 _{This bit can be written only one time after reset. Additional writes are ignored.}
Figure 5-10. System Power Management Status and Control 2 Register (SPMSC2)
0
PPDC¹
0
0
0
Table 5-11. 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 5-12.
Low-Voltage Warning Voltage Select — This bit selects the low-voltage warning (LVW) trip point
voltage.See Table 5-12.
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 5-12. 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.}
MC9S08JM16 Series Data Sheet, Rev. 2
Freescale Semiconductor
75