SIO1007 datasheet(50/108 Pages) MICROCHIP

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SIO1007

DS00002020A-page 50

 2005 - 2015 Microchip Technology Inc.

14.5

GPIO PME and SMI Functionality

The provides SIO1007 provides 16 GPIOs that can directly generate a PME. See the table in the next section. The GPIO

Polarity Registers in the Configuration section select the edge on these GPIO pins that will set the associated status bit

in the PME_STS1 – PME_STS3 registers. The default is the low-to-high edge. If the corresponding enable bit in the

PME_EN1 – PME_EN3 registers and the PME_EN bit in the PME_EN register is set, a PME will be generated. These

registers are located in the Runtime Registers Block, which is located at the address contained in the configuration reg-

isters CR30. The PME status bits for the GPIOs are cleared on a write of ‘1’. In addition, the SIO1007 provides 8 GPIOs

that can directly generate an SMI.

The following GPIOs are dedicated wakeup GPIOs with a status and enable bit in the PME status and enable registers:

GP10-GP17

GP30-GP37

This following is the list of PME status and enable registers for their corresponding GPIOs:

PME_STS1 and PME_EN1 for GP10-GP17

PME_STS3 and PME_EN3 for GP30-GP37

The following GPIOs can directly generate an SMI and have a status and enable bit in the SMI status and enable reg-

isters.

GP10-GP17

The following SMI status and enable registers for these GPIOs:

SMI_STS1 and SMI_EN1 for GP10-17

The following table summarizes the PME and SMI functionality for each GPIO.

Note 14-3

Since GP12 can be used to generate an SMI and as the IO_SMI# output, do not enable GP12 to

generate an SMI (by setting bit 2 of the SMI Enable Register 1) if the IO_SMI# function is selected

on the GP12 pin. Use GP12 to generate an SMI event only if the SMI output is enabled on the Serial

IRQ stream.

TABLE 14-5:

PME AND SMI FUNCTIONALITY

GPIO

PME Status and Enable

Registers

SMI Status and Enable

Registers

Output Buffer

Power

GP10-GP11

PME_STS1 & PME_EN1

SMI_STS1 and SMI_EN1

VCC

GP12 (See Note 14-3)

VCC

GP13-GP17

VCC

GP30-GP37

PME_STS1 & PME_EN1

None

VCC

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