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AT89C5132-ROTIL 数据表(PDF) 93 Page - ATMEL Corporation |
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AT89C5132-ROTIL 数据表(HTML) 93 Page - ATMEL Corporation |
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93 / 181 page  93 4173D–USB–02/06 AT89C5132 16.6.3.5 Busy Status As shown in Figure 16-4 the card uses a busy token during a block write operation. This busy status is reported by the CBUSY flag in MMSTA register and by the MCBI flag in MMINT which is set every time CBUSY toggles, i.e. when the card enters and exits its busy state. This flag may generate an MMC interrupt request as detailed in Section "Interrupt", page 96. Figure 16-16. Data Stream Transmission Flows Send STOP Command Data Stream Transmission Start Transmission DATEN = 1 DATEN = 0 FIFO Empty? F1EI or F2EI = 1? FIFO Filling Write 8 Data to MMDAT No More Data To Send? FIFOs Filling Write 16 Data to MMDAT a. Polling Mode Data Stream Initialization FIFOs Filling Write 16 Data to MMDAT Data Stream Transmission ISR FIFO Filling Write 8 Data to MMDAT Send STOP Command No More Data to Send? b. Interrupt Mode FIFO Empty? F1EI or F2EI = 1? Start Transmission DATEN = 1 DATEN = 0 Unmask FIFOs Empty F1EM = 0 F2EM = 0 Mask FIFOs Empty F1EM = 1 F2EM = 1 |
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