Rainbow Electronics AT89C5132 - Manual (Page 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
7 6 5 4 3 2 1 0
- 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.
7 6 5 4 3 2 1 0
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.