Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 80)

80

AT8xC5132

4173A–8051–08/02

Table 83. UBYCTLX Register

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

Reset Value = 0000 0000b

Table 84. 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 values read from this Bits are 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 ... 75 76 77 78 79 80 81 82 83 84 85 ... 161 162

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