Renesas CPU Board M3A-HS19 Manual de usuario descargar pdf (Pagina 27)

SH7285/SH7286 USB Function Module

USB to Serial Conversion Application Note

3.3 Serial Communication

The sample program uses a SCIF module

for serial communication. Serial OUT communication is executed only

when there is data in the bulk OUT transfer RAM, and serial IN communication is executed only by the serial receive

interrupt.

3.3.1 Serial OUT Communication

The sample program uses the ActSerialout function to execute serial OUT communication. Data in the bulk OUT

transfer RAM is serially transmitted in serial OUT communication. When the bulk OUT transfer RAM is sufficiently

empty by the

serial OUT communication, the sample program enables the EP1FULL interrupt. When the EP1FULL

interrupt is enabled, the suspended EP1FULL interrupt occurs to transfer data in the bulk OUT transfer.

Figure 3.7

shows an operation flowchart of the Serial OUT Communication.

Yes

Calculates the number of transfer bytes

SCSSR_2 TDFE = 1

Writes data to transmit in SCFTDR_2

Clears SCSSR_2 TDFE/TEND

Bulk OUT transfer

is disabled?

The bulk-OUT transfer

RAM is empty?

EP1FULL interrupt is enabled

USBIER/EP1FULL = 1

ActSerialOut

ExSerialOut

Serial OUT communication started

Serial OUT communication completed

Serial OUT communication

enables the EP1FULL

interrupt and the suspended

EP1FULL interrupt occurs.

Sample program (Software)

（Serial OUT communication)

Figure 3.7 Serial OUT Communication

This is for the M3A-HS85 with the SH7285 MCU. The SCI module is used on the M3A-HS87 with the SH7286 MCU.

REJ05B1152-0100/Rev.1.00 May 2008 Page 27 of 35

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Renesas CPU Board M3A-HS19 Manual de usuario Pagina 27