AT89C5132-ROTUL datasheet(93/181 Pages) ATMEL

93 / 181 page

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

AT89C5132-ROTUL Datasheet(PDF) 93 Page - ATMEL Corporation

AT89C5132-ROTUL Datasheet(HTML) 93 Page - ATMEL Corporation

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