upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 360

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

12.7.3 USB main processing
follows.
360
USB main processing involves processing USB transactions. The types of transactions to be processed are as
• Fully automatically processed request for control transfer
• Automatically processed requests for control transfer
• CPUDEC request for control transfer
• Processing for bulk transfer (IN)
• Processing for bulk transfer (OUT)
Processing for endpoint n involves writing or reading for data transfer.
(1) Fully automatically processed request for control transfer
(2) Automatically processed requests for control transfer
(SET_CONFIGURATION, SET_INTERFACE, SET_FEATURE, CLEAR_FEATURE)
Because the fully automatically processed request for control transfer is executed by hardware, it cannot be
referenced by FW. Therefore, FW does not have to perform any special processing for this request.
(SET_CONFIGURATION, SET_INTERFACE, SET_FEATURE, CLEAR_FEATURE)
Processing to write a register for automatically processed requests for control transfer, such as
SET_CONFIGURATION,
automatically executed by hardware, but an interrupt request is issued for recognition on the device side. This
processing may be ignored if there is no special processing to be executed.
The flowcharts are shown below.
CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
SET_INTERFACE,
Preliminary User’s Manual U19014EJ1V0UD
SET_FEATURE,
and
CLEAR_FEATURE
requests,
is