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6KOGTꢅ&CVCꢅ4GIKUVGT
9TKVGꢅꢈꢀꢀꢀꢎ*ꢉ
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4GUGV
6KOGTꢅ&CVC
4GIKUVGT
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4GNQCF
4GNQCF
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6KOGTꢅ4GNQCF
4GIKUVGT
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6&'ꢅ(NCI
6+(ꢅ(NCI
6KOGTꢅ&CVCꢅ4GIKUVGTꢅ4GCF
6KOGTꢅ%QPVTQNꢅ4GSWGUVQTꢅ4GCF
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6KOGTꢅ&CVC
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6KOGTꢅ&CVC
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6
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%NQEMGFꢄ5GTKCNꢄ+ꢃ1ꢄꢌ%5+ꢃ1ꢍꢆꢄꢄThe CSI/O channel provides
a half-duplex serial transmitter and receiver. This channel
can be used for simple high-speed data connection to an-
other microprocessor or microcomputer. 64&4 is used for
both CSI/O transmission and reception. Thus, the system
design must ensure that the constraints of half-duplex op-
eration are met (Transmit and Receive operation cannot oc-
cur simultaneously). For example, if a CSI/O transmission
isattemptedwhile the CSI/Oisreceivingdata, a CSI/Odoes
not work.
0QVGꢅ 64&4 is not buffered. Performing a CSI/O transmit
while the previous transmission is still in progress causes
the data to be immediately updated and corrupts the
transmit operation. Similarly, reading 64&4 while a
transmit or receive is in progress should be avoided.
&5ꢀꢀꢁꢀꢀꢂꢃ</2ꢀꢂꢀꢀ
2ꢅ4ꢅ'ꢅ.ꢅ+ꢅ/ꢅ+ꢅ0ꢅ#ꢅ4ꢅ;
ꢄꢏ
ZILOG [ ZILOG, INC. ]
