STPMIC25 datasheet(105/145 Pages) STMICROELECTRONICS

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6.6

Interrupt registers

6.6.1

Interrupt management overview

Interrupts are probed in the POWER_ON state only. All interrupts are masked by default. All interrupt registers are

reset to the default value as long as RSTn is asserted.

•

INT_PENDING_Rx

–

Stores events of interrupt sources, regardless if the interrupts are masked or not masked.

–

Corresponding bits are kept set until they are cleared (using INT_CLEAR_Rx registers).

•

INT_CLEAR_Rx

–

Setting a bit in these registers clears the corresponding pending bit in the INT_PENDING_Rx

registers. A bit in the INT_PENDING_Rx registers can be cleared only if the corresponding interrupt

source disappears. Alternatively, the bit stays set after being cleared. In the case of the

INT_PENDING_Rx bit generated by edge triggering, they can be directly deleted without checking

the INT_SOURCE_RX.

•

INT_MASK_Rx

–

Clearing a bit in these registers unmasks the corresponding interrupt.

–

The INTn pin is forced low as long as the corresponding interrupt bit is set in INT_PENDING_Rx.

•

INT_SOURCE_Rx

–

These registers provide the actual state of interrupt sources.

–

If an interrupt source is present, the corresponding bit is set. If the interrupt source disappears, the

corresponding bit is cleared.

•

INT_DBG_LATCH_Rx

–

Setting a bit in these registers emulates the corresponding interrupt event. These registers aim to test

and to debug the application processor software interrupt handler.

6.6.2

Interrupt pending register 1 (INT_PENDING_R1)

Table 71. INT_PENDING_R1

VBUS_RI

VBUS_FA

VINLOW_RI

VINLOW_FA

WKP_RI

WKP_FA

PKEY_RI

PKEY_FA

•

Address: 0x70

•

Default: 0x00

•

Description: Interrupt pending register 1 (see Section 6.6.1).

This register is reset to the default value as long as RSTn is asserted.

For all bits:

0: interrupt not pending

1: interrupt pending

[7]

VBUS_RI: Voltage on the VBUS pin rises above the VBUS_Rise threshold

[6]

VBUS_FA: Voltage on the VBUS pin falls below the VBUS_Fall threshold

[5]

VINLOW_RI: Voltage on the VIN pin falls below the VINLOW_Rise threshold

[4]

VINLOW_FA: Voltage on the VIN pin rises above the VINLOW_Fall threshold

[3]

WKP_RI: WAKEUP rising edge

[2]

WKP_FA: WAKEUP falling edge

[1]

PKEY_RI: PONKEYn rising edge

[0]

PKEY_FA: PONKEYn falling edge

STPMIC25

DS14278 - Rev 3

page 105/145

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