PC87591L datasheet(247/437 Pages) NSC

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Embedded Controller Modules (Continued)

Revision 1.07

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HFCG Control Register 2 (HFCGCTRL2)

The HFCGCTRL2 register sets the frequency multiplier’s operating parameters. On VCC power-up, WATCHDOG reset and

Debugger Interface reset, it is initialized to 0016.

Location: 00 FFAE16

Type: Varies per bit

Bit

76543210

Name

Reserved

96MON

MONERR

SCESTP

SCESTR

SENABLE

Reset

00000000

Bit

Type

Description

0RO

SIO ENABLE (Enable Host Domain Clock). Provides the status of the SuperI/O enable/disable

command. Any data written to this bit is ignored.

0: Disabled

1: Enabled

R/W1C SCESTR (SIO Clock Enable Start). Indicates that a rising edge was detected on the SENABEL

signal. When set, an interrupt is sent to the ICU (level high). Cleared by writing 1 to it. This interrupt

may be masked only in the ICU.

0: No rising edge on SENABLE was detected (default)

1: A rising edge on SENABLE was detected and an interrupt is sent to the ICU

R/W1C SCESTP (SIO Clock Enable Stop). Indicates that a falling edge was detected on the SENABEL

signal. When set, an interrupt is sent to the ICU (level high). Cleared by writing 1 to it. This interrupt

may be masked only in the ICU.

0: No falling edge on SENABLE was detected (default)

1: A falling edge on SENABLE was detected and an interrupt is sent to the ICU

R/W1C MONERR (Monitor Error). Indicates that a 48 MHz monitor error was detected during the last

WATCHDOG or Debugger Reset process. Note that this bit is cleared by all resets except WATCHDOG

and Debugger Interface resets. Once set, this bit is cleared by writing 1 to it.

0: No error detected (default)

1: 48 MHz monitor detected an out of range frequency

4RO

96MON (96 MHz Oscillations On). Indicates the oscillation frequency at which the HFCG is operating.

0: HFCG is oscillating as defined by the HFCGM and HFCGN. The core clock is identical to HFCG fre-

quency.

1: HFCG is oscillating at 96 MHz. The core clock is pre-scaled as defined by HFCGP.

7-5

Reserved.

PC87591L Datasheet(PDF) 247 Page - National Semiconductor (TI)

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