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Data Sheet
AD9557
Rev. B | Page 91 of 92
Table 125. Multifunction Pin Input Functions (D7 = 0)
Register Value
Input Function
Equivalent Control Register
0x00
Reserved, high-Z input
0x01
I/O update
Register 0x0005, Bit 0
0x02
Full power-down
Register 0x0A00, Bit 0
0x03
Clear watchdog
Register 0x0A03, Bit 0
0x04
Clear all IRQs
Register 0x0A03, Bit 1
0x05
Tuning word history reset
Register 0x0A03, Bit 2
0x06 to 0x0E
Reserved
0x10
User holdover
Register 0x0A01, Bit 6
0x11
User free run
Register 0x0A01, Bit 5
0x12
Reset incremental phase offset
Register 0x0A0A, Bit 2
0x13
Increment incremental phase offset
Register 0x0A0A, Bit 0
0x14
Decrement incremental phase offset
Register 0x0A0A, Bit 1
0x15 to 0x1F
Reserved
0x20
Override Reference Monitor A
Register 0x0A0C, Bit 0
0x21
Override Reference Monitor B
Register 0x0A0C, Bit 1
0x22 to 0x2F
Reserved
0x30
Force Validation Timeout A
Register 0x0A0B, Bit 0
0x31
Force Validation Timeout B
Register 0x0A0B, Bit 1
0x32 to 0x3F
Reserved
0x40
Enable OUT0
Register 0x0501, Bit 0
0x41
Enable OUT1
Register 0x0505, Bit 0
0x42 to 0x45
Reserved
0x46
Enable OUT0 and OUT1
Register 0x0501 and Register 0x0505, Bit 0
0x47
Sync clock distribution outputs
Register 0x0A02, Bit 1
0x48 to 0xFF
Reserved