TH6503 Datasheet, PDF (3/24 Pages) List of Unclassifed Manufacturers – USB Low-Speed Interface

TH6503 USB Low-Speed Interface
TH6503/
Microcontroller
Cooperation
(continued)
VBus 1
GND 5
Power
Supply
3.3V
V3.3 2
10µ
1k5
D- 3
D+ 4
USB
I/O
SIE
Status Signals
Serial
Interface
Engine
Micro-
Control Signals _controller
Interface
Bus Interface
13 SCK
12 SIN
11 SDI
10 SDO
14 /ORST
Oscillator/
Divider
6
7
8
16
WAKE
15 ^OCLK
V3.3
Figure 3. TH6503 Block Diagram
Microcontroller
Interface
The data is transferred between the microcontroller and the USB bridge using the clock (SCK)
generated by the microcontroller asynchronous to the USB clock.
Data IN Transfer
(from the microcontroller to the TH6503)
Data IN transfer is initiated with rising SIN edge (IN
packet sync). Data is transferred via the SDI pin.
Initially the Adr/CntInRegister which indicates the
internal address in the TH6503 is written. Data is
subsequently transferred beginning with byte 0 to
Byte n LSB first. Bits IC3-IC0 in the Adr/CntInRegister
<3-0> contain the information on the number of
bytes to be transferred to the USB host if the target
of the data transfer was an IN FIFO.
A zero data transfer is identified with reset of IC3-
IC0 bits after writing the Adr/CntInRegister one
additional clock on SCK must be generated.
If a register is the target of the data IN transfer the
bits IC3-IC0 and TI have no meaning.
With falling SCK edge the microcontroller trans-
mit the bits to SDI and the bits are imported from
the bridge with increasing SCK edge. After each
transmission of 8 bits the respective IN FIFO value
is increased by 1. If the microcontroller writes
more data than indicated in the Adr/CntInRegister,
the oldest data are overwritten. After the final
falling edge of SCK first SDI and then SIN must be
reset to 0 to terminate the transfer. The associated
IN Done bit in the StatusRegister is reset automati-
cally to enable USB IN transfer.
3