S9S08QD2CSC datasheet(64/198 Pages) FREESCALE

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Chapter 5 Resets, Interrupts, and General System Control

MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

5.8.8

System Power Management Status and Control 1 Register

(SPMSC1)

This high-page register contains status and control bits to support the low voltage detect function, and to

enable the bandgap voltage reference for use by the ADC module. To configure the low voltage detect trip

voltage, see Table 5-13 for the LVDV bit description in SPMSC2.

Table 5-11. Real-Time Interrupt Period

RTIS2:RTIS1:RTIS0

Using Internal 1 kHz Clock Source1 2

1 Values are shown in this column based on t

RTI =1ms. See tRTI in the Section A.8.1, “Control Timing,” for the tolerance of this

value.

2 The initial RTI timeout period will be up to one 1 kHz clock period less than the time specified.

Using 32 kHz ICS Clock Source

Period = text

3 t

ext is the period of the 32 kHz ICS frequency.

0:0:0

Disable RTI

0:0:1

8 ms

text × 256

0:1:0

32 ms

text × 1024

0:1:1

64 ms

text × 2048

1:0:0

128 ms

text × 4096

1:0:1

256 ms

text × 8192

1:1:0

512 ms

text × 16384

1:1:1

1.024 s

text × 32768

RLVDF

LVDIE

LVDRE2

LVDSE

LVDE 2

BGBE

LVDACK

Reset:

000

100

= Unimplemented or Reserved

1 Bit 1 is a reserved bit that must always be written to 0.

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

Figure 5-10. System Power Management Status and Control 1 Register (SPMSC1)

Table 5-12. SPMSC1 Register Field Descriptions

Field

Description

LVDF

Low-Voltage Detect Flag — Provided LVDE = 1, this read-only status bit indicates a low-voltage detect event.

LVDACK

Low-Voltage Detect Acknowledge — This write-only bit is used to acknowledge low voltage detection errors

(write 1 to clear LVDF). Reads always return 0.

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