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MCP4661T Datasheet(PDF) 39 Page - Microchip Technology |
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MCP4661T Datasheet(HTML) 39 Page - Microchip Technology |
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39 / 92 page  © 2008 Microchip Technology Inc. DS22107A-page 39 MCP454X/456X/464X/466X 4.2.2.1 Status (STATUS) Register This register contains 4 status bits. These bits show the state of the WiperLock bits, the Write Protect bit, and if an EEPROM write cycle is active. The STATUS register can be accessed via the READ commands. Register 4-1 describes each STATUS register bit. The STATUS register is placed at Address 05h. REGISTER 4-1: STATUS REGISTER (ADDRESS = 0x05) R-1 R-1 R-1 R-1 R-1 R-0 R-x R-x R-x D8:D4 EEWA WL1 (1) WL0 (1) WP (1) bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 8-4 D8:D4: Reserved. Forced to “1” bit 3 EEWA: EEPROM Write Active Status bit This bit indicates if the EEPROM Write Cycle is occurring. 1 = An EEPROM Write cycle is currently occurring. Only serial commands to the Volatile memory locations are allowed (addresses 00h, 01h, 04h, and 05h) 0 = An EEPROM Write cycle is NOT currently occurring bit 2 WL1: WiperLock Status bit for Resistor Network 1 (Refer to Section 5.3 “WiperLock™ Technology” for further information) WiperLock (WL) prevents the Volatile and Non-Volatile Wiper 1 addresses and the TCON register bits R1HW, R1A, R1W, and R1B from being written to. High Voltage commands are required to enable and disable WiperLock Technology. 1 = Wiper and TCON register bits R1HW, R1A, R1W, and R1B of Resistor Network 1 (Pot 1) are “Locked” (Write Protected) 0 = Wiper and TCON of Resistor Network 1 (Pot 1) can be modified Note: The WL1 bit always reflects the result of the last programming cycle to the non-volatile WL1 bit. After a POR or BOR event, the WL1 bit is loaded with the non-volatile WL1 bit value. bit 1 WL0: WiperLock Status bit for Resistor Network 0 (Refer to Section 5.3 “WiperLock™ Technology” for further information) The WiperLock Technology bits (WLx) prevents the Volatile and Non-Volatile Wiper 0 addresses and the TCON register bits R0HW, R0A, R0W, and R0B from being written to. High Voltage commands are required to enable and disable WiperLock Technology. 1 = Wiper and TCON register bits R0HW, R0A, R0W, and R0B of Resistor Network 0 (Pot 0) are “Locked” (Write Protected) 0 = Wiper and TCON of Resistor Network 0 (Pot 0) can be modified Note: The WL0 bit always reflects the result of the last programming cycle to the non-volatile WL0 bit. After a POR or BOR event, the WL0 bit is loaded with the non-volatile WL0 bit value. Note 1: Requires a High Voltage command to modify the state of this bit (for Non-Volatile devices only). This bit is Not directly written, but reflects the system state (for this feature). |
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