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FDC37C78-HT Datasheet(PDF) 65 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 65 Page - Microchip Technology |
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65 / 82 page  65 CR00 This register can only be accessed when the chip is in the Configuration Mode and after the CSR has been initialized to 00H. The default value of this register after power up is 28H. Table 34 - CR00 BIT NO. BIT NAME DESCRIPTION 0:1 Reserved Read only. Read as 0 2 PDEN Power Down and Idle enable. 0 nDS1pin=nDS1, nMTR1pin=nMTR1 1 nDS1pin=Power Down, nMTR1pin=Idle 3 FDC Power A high level on this bit, supplies power to the FDC (default). A low level on this bit puts the FDC in low power mode. 4, 6 Reserved Read only. A read returns bits 4 and 6 as a 0. 5 OSC Oscillator Control. 0 = Oscillator OFF 1 = Oscillator ON (default) 7 Valid A high level on this software controlled bit can be used to indicate that a valid configuration cycle has occurred. The control software must take care to set this bit at the appropriate times. Set to zero after power up. This bit has no effect on any other hardware in the chip. CR01 This register can only be accessed in the Configuration Mode and after the CSR has been initialized to 01H. The default value of this register after power up is 90H. Table 35 - CR01 BIT NO. BIT NAME DESCRIPTION 0,1,2,3 Reserved Read Only. A read returns a 0. 4 Reserved Read Only. A read returns a 1. 5,6 Reserved Read Only. A read returns a 0. 7 Lock CRx A high level on this bit enables the reading and writing of CRxx registers (Default). A low level on this bit disables the reading and writing of all CRxx registers. Once set to 0, this bit can only be set to 1 by a hard reset or power-up reset. |
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