IRCC SMSC Corporation, IRCC Datasheet - Page 71

• Manufacturer Part Number: IRCC
• Description: INFRARED COMMUNICATIONS CONTROLLER
• Manufacturer: SMSC Corporation

Programmed I/O mode is selected when the
DMA Enable bit in SCE Configuration Register B
is zero.
Polling Interface
Programmed I/O without IOCHRDY requires
polling the FIFO status flags before reading or
writing FIFO data.
depends upon the FIFO Not Empty flag. If FIFO
FIFO NOT EM PT Y
FIFO Data READ
F IF O N ot E m pty
String M ove
DM A Enable
S trin g M ov e
The Receiver interface
IO C HR DY
IOR
FIGURE 42 - PROGRAMMED I/O READ TIMING
AE N
FIGURE 41 - STRING MOVE TIMING
IO R
Status READ
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is a block-mode programmed I/O operation that
utilizes IOCHRDY to control the transfer (Figure
41).
String Move bit in SCE Configuration Register B
is one.
Not Empty is true, there is read data available in
the FIFO (Figure 42). The Transmitter interface
depends upon the FIFO Full flag. If FIFO Full is
false, there is room for write data in the FIFO (
Figure 43).
String Move mode is selected when the