SC9RS08KA2 datasheet(43/134 Pages) FREESCALE

43 / 134 page

Chapter 5 Resets, Interrupts, and General System Control

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

5.8.5

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 ACMP and the LVD module.

Figure 5-6. System Power Management Status and Control 1 Register (SPMSC1)

321

RLVDF

LVDIE

LVDRE(1)

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

LVDSE

LVDE(1)

BGBE

LVDACK

Reset:

000

100

= Unimplemented or Reserved

Table 5-8. 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.

LVDIE

Low-Voltage Detect Interrupt Enable — This bit enables hardware interrupt requests for LVDF.

0 Hardware interrupt disabled (use polling).

1 Request a hardware interrupt when LVDF = 1.

LVDRE

Low-Voltage Detect Reset Enable — This write-once bit enables low-voltage detect events to generate a

hardware reset (provided LVDE = 1).

0 LVDF does not generate hardware resets.

1 Force an MCU reset when LVDF = 1.

LVDSE

Low-Voltage Detect Stop Enable — Provided LVDE = 1, this read/write bit determines whether the low-voltage

detect function operates when the MCU is in stop mode.

0 Low-voltage detect disabled during stop mode.

1 Low-voltage detect enabled during stop mode.

LVDE

Low-Voltage Detect Enable — This write-once bit enables low-voltage detect logic and qualifies the operation

of other bits in this register.

0 LVD logic disabled.

1 LVD logic enabled.

BGBE

Bandgap Buffer Enable — This bit enables an internal buffer for the bandgap voltage reference for use by the

ACMP module on one of its internal channels.

0 Bandgap buffer disabled.

1 Bandgap buffer enabled.

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