Rainbow-electronics AT89C51SND1C Manual de usuario descargar pdf (Pagina 107)

107

AT8xC51SND1C

4109E–8051–06/03

Table 101. UBYCTX Register

UBYCTX (S:E2h) – USB Endpoint X Byte Count Register (X = EPNUM set in UEPNUM)

Reset Value = 0000 0000b

Table 102. UFNUML Register

UFNUML (S:BAh, Read-only) – USB Frame Number Low Register

Reset Value = 00h

76543210

- BYCT6 BYCT5 BYCT4 BYCT3 BYCT2 BYCT1 BYCT0

Bit

Number

Bit

Mnemonic Description

7-

Reserved

The value read from this bits is always 0. Do not set this bit.

6 - 0 BYCT7:0

Byte Count

Byte count of a received data packet. This Byte count is equal to the number of

data Bytes received after the Data PID.

76543210

FNUM7 FNUM6 FNUM5 FNUM4 FNUM3 FNUM2 FNUM1 FNUM0

Bit

Number

Bit

Mnemonic Description

7 - 0 FNUM7:0

Frame Number

Lower 8 bits of the 11-bit Frame Number.

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 209 210

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