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MB90F474LPF Arkusz danych(PDF) 37 Page - fujitsu semiconductor |
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MB90F474LPF Arkusz danych(HTML) 37 Page - fujitsu semiconductor |
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37 / 118 page  MB90470 Series 37 3. Expanded I/O Serial Interface The expended I/O serial interface is a serial I/O interface in 8-bit × 1 channel configuration allowing clock synchronized data transmission. The interface has two serial I/O operating modes. • Internal shift clock mode : Data transfer is synchronized with an internal clock. • External shift clock mode : Data transfer is synchronized with a clock input from an external pin (SCK) . This mode allows the external clock pin (SCK) to be shared with a general purpose port that can transfer data according to CPU instructions. (1) Register List Serial mode control status register (SMCS) Serial data register (SDR) Communication prescaler control register (SDCR0, SDCR1) Initial value Address : 000027H 00002BH 0 0 0 0 0 0 1 0B Initial value Address : 000026H 00002AH - - - - 0 0 0 0B Initial value Address : 000028H 00002CH XXXXXXXXB Initial value Address : 000029H 00002DH 0 - - - 0000B 15 14 13 12 11 10 9 8 SMD1 SMD2 SMD0 SIE SIR BUSY STOP STRT (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) 76 5 4 3 2 1 0 MODE BDS SOE SCOE (R/W) (R/W) (R/W) (R/W) ( ) ( ) ( ) ( ) 76 5 4 3 2 1 0 D6 D7 D5 D4 D3 D2 D1 D0 (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) ( )( )( ) (R/W) (R/W) (R/W) (R/W) 15 14 13 12 11 10 9 8 (R/W) MD DIV3 DIV2 DIV1 DIV0 |
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