PC87373 datasheet(91/174 Pages) NSC

91 / 174 page

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

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Revision 1.1

6.3.4

Advanced LED Control Register (ALEDCTL)

This register configures the advanced LED control of the two LEDs connected to pins GRN_LED and YLW_LED of the

PC87373 device. It is reset to 00h.

Power Well: VSB3

Location:

Offset 02h, when LED_OPT = 00 in the SWC_CTL register

Type:

R/W or RO

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 to the

GRN_LED and YLW_LED pins or one dual-colored LED, connected between the two pins (see Figure 16 on

page 85).

0: One dual-colored LED (default)

1: Two regular LEDs

LEDPOL (LED Polarity). This bit determines the polarity of GRN_LED and YLW_LED 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. The conﬁgurations described here apply to the “two regular LEDs” option only; see

Table 32 on page 86).

0: Active high: for connection configuration “b” in Figure 16 on page 85 (default)

1: Active low: for connection configuration “a” in Figure 16 on page 85

3-2

Reserved.

1-0

LEDMOD (LED Operation Mode). These bits control the operation mode of GRN_LED and YLW_LED in each

power state. Table 35 shows the behavior of the two LED outputs as a function of the system power state.

Table 35. GRN_LED and YLW_LED as a Function of the Power State

LEDMOD

VDD3 Off

1. See Section 2.1.2 on page 27.

VDD3 On

State S52

2. See Section 6.2.3 on page 84.

State S32

States S0 - S22

GRN_LED

YLW_LED

00 (default)

3. In this table, X is “Irrelevant”.

XXX

S/W_GRN4

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

S/W_YLW5

5. Controlled by the value of YLWBLNK in the LEDBLNK register.

Yes

S/W_GRN

Blink6

6. Blink rate is 1 Hz with a duty cycle of 50%.

Yes

S/W_GRN

S/W_YLW

Yes

Off

Yes

S/W_GRN

S/W_YLW

Yes

S/W_GRN

S/W_YLW

Yes

Off

Yes

S/W_GRN

S/W_YLW

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