Datasheet

146
4337K–USB–04/08
AT89C5130A/31A-M
Table 21-12. UBYCTHX Register
UBYCTHX (S:E3h)
USB Byte Count High Register X (X = EPNUM set in UEPNUM Register UEP-
NUM (S:C7h) USB Endpoint Number)
Reset Value = 00h
7 6 5 4 3 2 1 0
- - - - - - BYCT9 BYCT8
Bit Number Bit Mnemonic Description
7-2 -
Reserved
The value read from these bits is always 0. Do not set these bits.
2-0 BYCT[10:8]
Byte Count MSB
Most Significant Byte of the byte count of a received data packet. The Least significant
part is provided by UBYCTLX Register UBYCTLX (S:E2h) USB Byte Count Low
Register X (X = EPNUM set in UEPNUM Register UEPNUM (S:C7h) USB Endpoint
Number) (see Figure 21-11 on page 145).