EZ-USB Datasheet, PDF (314/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

CLK24
PSEN
RXD0
RXD0OUT
TXD0
TI
RI
D0
D1
D2
D3
D4
D5
D6
D7
Figure C-9. Serial Port Mode 0 Transmit Timing - Low Speed Operation
CLK24
PSEN
RXD0
RXD0OUT
TXD0
TI
RI
D0
D1
D2
D3
D4
D5
D6
D7
Figure C-10. Serial Port Mode 0 Transmit Timing - High Speed Operation
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Appendix C: 8051 Hardware Description
EZ-USB TRM v1.9