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ST25DV64K 数据表(PDF) 38 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 38 Page - STMicroelectronics |
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38 / 200 page  Table 30. GPO_CTRL_Dyn Bit Name Function Factory Value b0 RF_USER_EN 0: disabled 1: GPO output level is controlled by Manage GPO Command (set/reset) 0b b1 RF_ACTIVITY_EN 0: disabled 1: GPO output level changes from RF command EOF to response EOF. 0b b2 RF_INTERRUPT_EN 0: disabled 1: GPO output level is controlled by Manage GPO Command (pulse). 0b b3 FIELD_CHANGE_EN 0: disabled 1: A pulse is emitted on GPO, when RF field appears or disappears. 1b b4 RF_PUT_MSG_EN 0: disabled 1: A pulse is emitted on GPO at completion of valid RF Write Message command. 0b b5 RF_GET_MSG_EN 0: disabled 1: A pulse is emitted on GPO at completion of valid RF Read Message command if end of message has been reached. 0b b6 RF_WRITE_EN 0: disabled 1: A pulse is emitted on GPO at completion of valid RF write operation in EEPROM. 0b b7 GPO_EN 0: GPO output is disabled. GPO is High-Z (open drain) or 0 (CMOS) 1: GPO output is enabled. GPO outputs enabled interrupts. 1b Note: Refer to Table 12. Dynamic registers memory map for the GPO_CTRL_Dyn register. • Allows I2C host to dynamically enable or disable GPO output by writing in GPO_EN bit (b7). • GPO_EN bit of GPO_CTRL_Dyn register is prevalent over GPO_EN bit of GPO register. • At power up, and each time GPO register is updated, GPO_CTRL_Dyn content is copied from GPO register. • GPO_CTRL_Dyn is a volatile register. Value is maintained only if at least one of the two power sources is present (RF field or VCC). • GPO_CTRL_Dyn bit 7 (GPO_EN) can be written even if I2C security session is closed (I2C password not presented) but is read only for RF user. • Modifying GPO_CTRL_Dyn, the bit 7 GPO_EN does not affect the value of GPO register bit 7 GPO_EN Table 31. IT_STS_Dyn access RF I2C Command Type Address Type No access E2 = 0, 2005h RO ST25DV04K ST25DV16K ST25DV64K GPO DS10925 - Rev 9 page 38/200 |
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