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WM8352 Datasheet(PDF) 207 Page - Wolfson Microelectronics plc |
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WM8352 Datasheet(HTML) 207 Page - Wolfson Microelectronics plc |
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207 / 336 page  Production Data WM8352 w PD, February 2011, Rev 4.4 207 24.3.12 WAKE-UP INTERRUPTS The first-level WKUP_INT interrupt comprises several second-level interrupts. After a system reset, these indicate to the host processor why the reset occurred. Each wake-up interrupt has a status bit in Register R31 and a mask bit in Register R30, as defined in Table 154. ADDRESS BIT LABEL DESCRIPTION R31 (1Fh) Comparator Interrupt Status 6 WKUP_OFF_STATE_EINT Indicates that the chip started from the OFF state. (Rising Edge triggered) Note: This bit is cleared once read. 5 WKUP_HIB_STATE_EINT Indicated the chip started up from the hibernate state. (Rising Edge triggered) Note: This bit is cleared once read. 4 WKUP_CONV_FAULT_EINT Indicates the wakeup was caused by a converter fault leading to the chip being reset. (Rising Edge triggered) Note: This bit is cleared once read. 3 WKUP_WDOG_RST_EINT Indicates the wakeup was caused by a watchdog heartbeat being missed, and hence the chip being reset. (Rising Edge triggered) Note: This bit is cleared once read. 2 WKUP_GP_PWR_ON_EINT PWR_ON (Alternate GPIO function) pin has been pressed for longer than specified time. (Rising Edge triggered) Note: This bit is cleared once read. 1 WKUP_ONKEY_EINT ON key has been pressed for longer than specified time. (Rising Edge triggered) Note: This bit is cleared once read. 0 WKUP_GP_WAKEUP_EINT WAKEUP (Alternate GPIO function) pin has been pressed for longer than specified time. (Rising Edge triggered) Note: This bit is cleared once read. R39 (27h) Comparator Interrupt Status Mask 6:0 “IM_” + name of respective bit in R31 Interrupt mask. 0 = Do not mask interrupt. 1 = Mask interrupt. Each bit in R39 enables or masks the corresponding bit in R31. The default value for these bits is 0 (unmasked). Table 154 Wake-up Interrupts |
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