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ST25DV64K 数据表(PDF) 36 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 200 page  5.2.3 GPO registers Four registers are dedicated to this feature: • Two static registers in system configuration • Two dynamic registers Table 25. GPO access RF I2C Command Type Address Type Read Configuration (cmd code A0h) @00h Write Configuration (cmd code A1h) @00h R always, W if RF configuration security session is open and configuration not locked E2=1, 0000h R always, W if I2C security session is open Table 26. GPO 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 11. System configuration memory map for the GPO register. • Enables the interruption source, and enable GPO output. • Several interruption sources can be enabled simultaneously. • The updated value is valid for the next command (except for the RF_WRITE interrupt, which is valid right after EOF of the Write Configuration command if enabled through RF). • The GPO_EN bit (b7) allows to disable GPO output (High-Z for open drain version, driven low for CMOS version). Interruptions are still reported in IT_STS_Dyn register. • RF configuration security session (present RF password 0) or I2C security session (present I2C password) must be open in order to write the GPO register. ST25DV04K ST25DV16K ST25DV64K GPO DS10925 - Rev 9 page 36/200 |
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