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ST25DV04K Datasheet(PDF) 57 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 57 Page - STMicroelectronics |
57 / 220 page DocID027603 Rev 4 57/220 ST25DV04K ST25DV16K ST25DV64K ST25DVxxx specific features 219 • Cumulates all events which generate interruptions. It should be checked by I2C host to know which event triggered an interrupt on GPO pin. • When enabled, RF events are reported in IT_STS_Dyn register even if GPO output is disabled though the GPO_EN bit. • Once read the ITSTS_Dyn register is cleared (set to 00h). • At power up, IT_STS_Dyn content is cleared (set to 00h). • IT_STS_Dyn is a volatile register. Value is maintained only if at least one of the two power sources is present (RF field or VCC). 5.2.4 Configuring GPO GPO and interruption pulse duration can be configured by RF user or by I2C host. One or more interrupts can be enabled at same time. RF user can use Read Configuration and Write Configuration commands to set accordingly the GPO and IT_TIME registers, after presenting a valid RF configuration password to open RF configuration security session. Table 21. IT_STS_Dyn(1) RF Command No access Type I2C Address E2 = 0, 2005h Type RO Bit Name Function Factory Value b0 RF_USER 0: Manage GPO reset GPO 1: Manage GPO set GPO 0b b1 RF_ACTIVITY 0: No RF access 1: RF access 0b b2 RF_INTERRUPT 0: No Manage GPO interrupt request 1: Manage GPO interrupt request 0b b3 FIELD_FALLING 0: No RF field falling 1: RF Field falling 0b b4 FIELD_RISING 0: No RF field rising 1: RF field rising 0b b5 RF_PUT_MSG 0: No message put by RF in FTM mailbox 1: Message put by RF in FTM mailbox 0b b6 RF_GET_MSG 0: No message read by RF from FTM mailbox 1: Message read by RF from FTM mailbox, and end of message has been reached. 0b b7 RF_WRITE 0: No write in EEPROM 1: Write in EEPROM 0b 1. Refer to Table 9: Dynamic registers memory map for the IT_STS_Dyn register. |
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