AT89C5131A-RDTIM datasheet(143/186 Pages) ATMEL

143 / 186 page

143

AT89C5130A/31A-M

4337G–USB–11/06

Table 99.

UEPDATX Register

UEPDATX (S:CFh)

USB FIFO Data Endpoint X (X = EPNUM set in UEPNUM Register UEPNUM (S:C7h)

USB Endpoint Number)

Reset Value = XXh

Table 100.

UBYCTLX Register

UBYCTLX (S:E2h)

USB Byte Count Low Register X (X = EPNUM set in UEPNUM Register UEPNUM

(S:C7h) USB Endpoint Number)

Reset Value = 00h

765

43210

FDAT7

FDAT6

FDAT5

FDAT4

FDAT3

FDAT2

FDAT1

FDAT0

Bit Number

Bit

Mnemonic Description

7 - 0

FDAT[7:0]

Endpoint X FIFO data

Data byte to be written to FIFO or data byte to be read from the FIFO, for the

Endpoint X (see EPNUM).

765

43210

BYCT7

BYCT6

BYCT5

BYCT4

BYCT3

BYCT2

BYCT1

BYCT0

Bit Number

Bit

Mnemonic Description

7 - 0

BYCT[7:0]

Byte Count LSB

Least Significant Byte of the byte count of a received data packet. The most

significant part is provided by the UBYCTHX Register UBYCTHX (S:E3h) USB

Byte Count High Register X (X = EPNUM set in UEPNUM Register UEPNUM

(S:C7h) USB Endpoint Number) (see Figure 100 on page 143). This byte count is

equal to the number of data bytes received after the Data PID.

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