MC9S08DZ96F2CLL datasheet(100/458 Pages) FREESCALE

100 / 458 page

Chapter 5 Resets, Interrupts, and General System Control

MC9S08DZ128 Series Data Sheet, Rev. 1

100

Freescale Semiconductor

5.8.8

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 should 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.

Figure 5-10. System Power Management Status and Control 2 Register (SPMSC2)

210

LVDV1

1 This bit can be written only one time after power-on reset. Additional writes are ignored.

LVWV

PPDF

PPDC2

2 This bit can be written only one time after reset. Additional writes are ignored.

PPDACK

Power-on Reset:

LVD Reset:

Any other Reset:

= Unimplemented or Reserved

u = Unaffected by reset

Table 5-11. SPMSC2 Register Field Descriptions

Field

Description

LVDV

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.

LVWV

Low-Voltage Warning Voltage Select — This bit selects the low-voltage warning (LVW) trip point voltage. See

Table 5-12.

PPDF

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.

PPDACK

Partial Power Down Acknowledge — Writing a 1 to PPDACK clears the PPDF bit.

PPDC

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

1 See Appendix A, “Electrical Characteristics” for minimum and maximum values.

LVDV:LVWV

LVW Trip Point

LVD Trip Point

0:0

VLVW0 = 2.74 V

VLVD0 = 2.56 V

0:1

VLVW1 = 2.92 V

1:0

VLVW2 = 4.3 V

VLVD1 = 4.0 V

1:1

VLVW3 = 4.6 V

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