PC87413 datasheet(190/257 Pages) NSC

190 / 257 page

9.0 System Wake-Up Control (SWC) (Continued)

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190

Revision1.2

9.3.12

LED Control Register (LEDCTL)

This register controls the operation mode of the two LEDs driven by the PC8741x device. It is reset by hardware to 00h.

Power Well:VPP

Location: All Banks, Offset 0Ah

Type:

R/W

Bit

43210

Name

Reserved

LEDCFG

LEDPOL

Reserved

LEDMOD

Reset

00000

Bit

Description

7-6

Reserved.

LEDCFG (LED Configuration). This bit enables the use of either two regular LEDs, connected between each

pin (LED1, LED2) and ground or VSB, or one dual-colored LED, connected between the LED1 and LED2 pins.

0: One dual-colored LED (default)

1: Two regular LEDs

LEDPOL (LED Polarity). This bit determines the polarity of LED1 and LED2 outputs. An active output,

according to this bit setting, turns the LED On. For the dual-colored LED conﬁguration, changing the polarity

reverses the LED colors.

0: Active high - LED cathode connected to ground (default)

1: Active low - LED anode connected to VSB

3-2

Reserved.

1-0

LEDMOD (LED Operation Mode). These bits control the operation mode of LED1 and LED2 in each power

state. Table 50 shows the behavior of the LED1 and LED2 outputs as a function of the system power state.

Table 50. LED1 and LED2 as a Function of the Power State

LEDMOD

Power Fail1

1. Power Fail: VSB and VDD Off. Power Off: VSB On, VDD Off. Power On: VSB and VDD On;

Power Off1

State S452

2. Sleep states S3I and S45 are PC8741x device current states (see Section 9.3.31 on page 200).

State S3I2

Power On1

LED1

LED2

(default)

Yes

Off

XXXX

S/W13

3. Controlled by the value of LED1BLNK in the LEDBLNK register.

S/W24

4. Controlled by the value of LED2BLNK in the LEDBLNK register.

Yes

Off

Yes

Blink5

5. 1 Hz blink with 50% duty cycle.

Blink5

Yes

S/W1

S/W2

Yes

Off

Yes

Off

Yes

S/W1

S/W2

Yes

S/W1

S/W2

Yes

Off

Yes

S/W1

S/W2

Yes

S/W1

S/W2

Yes

S/W1

S/W2

PC87413 Datasheet(PDF) 190 Page - National Semiconductor (TI)

PC87413 Datasheet(HTML) 190 Page - National Semiconductor (TI)

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