PC87373 datasheet(85/174 Pages) NSC

85 / 174 page

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

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Revision 1.1

Figure 15. SCI Generation

The SCI interrupt (SIOPME) is routed to the system interrupt (IRQ) by setting the Interrupt Number value, in the Interrupt

Number register, located at index 70h in the SWC Configuration (see Section 3.12.2 on page 59).

6.2.5

LED Control

The PC87373 device controls the operation of two LED indicators. The two open-drain buffers allow the connection of either

two regular LEDs or one dual-color LED.

The LEDs can be connected to PC87373 using one of the configurations shown in Figure 16.

Figure 16. LED Connection Conﬁgurations

The LED pins are named GRN_LED (Green LED) and YLW_LED (Yellow LED), although other LED colors can be used.

The PC87373 allows three LED control options, which are selected by LED_OPT field in SWC_CTL register (see Section

6.3.3 on page 90):

Standard LED control: On/Off and Blink controlled by software or by S5 sleep state

Advanced LED control: On/Off and Blink controlled by software, by S3 or S5 sleep states, or by the VDD3 power sup-

ply status

Special LED control: On/Off and Blink controlled by software, by S3 or S5 sleep states or by the Main power supply

status via the PWRGD_PS signal

From the base address of the SWC registers, the register for Standard LED Control is located at offset 00h, the two registers

for Advanced LED Control are located at offsets 02h and 03h, and the register for Special LED Control is located at offset

02h (see Section 6.3.1 on page 88). The active control registers are selected by LED_OPT field.

The blink rate and duty cycle of all LED control options are based on a clock, which is obtained by dividing the frequency of

the 32 KHz clock domain.

Enable

GPE1_STS_0-3

Status

Set

GPE1_EN_0-3

Detected Event

(SIOPME)

From Other

Enabled Events

SCI Interrupt

PME_EN

GPE1_STS

PME_STS

Set

GPE1_EN

IRQ

Routing

Control

a. Active Low

LED

VSUP

LED

VSUP

LED

VSUP

b. Active High

c. Dual-Color

GRN_LED

YLW_LED

GRN

YLW

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