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CPU
Zilog
CPU
The SIO channels
0
through 7 are provided by the Z8DS
SIO/2
devices, SIO
0
through SIO
3 (U90
to
U93).
Each channel has
separate programmable baud rate generation from one of three
channels
within the three
zeos
Counter/Timers (CTCs), CTC
0
through CTC 2
(U43,U44
and
U89).
Each SIO channel is supplied by a separate baud rate genera-
tor
channel
(ZC/TOO - ZC/T02) within the CTC.
An indepen-
dent 1.2288 MHz baud rate clock is
supplied
to
the
clock
triggers of each eTC.
Figure
4-4
illustrates the SIO channels and
the
supporting
baud
generation
from
the
CTCs.
The
SIO
channels
are
intended for asynchronous communications only.
lis
Figure 4-4
Serial I/O with CTC Channels
(Sheets 4, S, 6, 7)
!
4-6
Zilog
4-6
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