TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual 24-96 V2.0, 2007-07
GPTA, V2.0
Figure 24-63 shows the logical structure of an OMG.
Figure 24-63 Output Multiplexer Group (OMG) Structure
Rules for connections to Output Multiplexer Group OMG:
• Within a GTC or LTC group, the output of the cell with the lowest index number is
connected to OMG input line IN0. The remaining cells of a cell group are connected
to OMG input lines IN1 to IN7 with ascending cell index numbers.
Example: for OMG13 (see Figure 24-62), the cells LTC24 up to LTC31 are wired to
the OMG13 input lines IN0 to line IN7.
• OMG output line OUT0 is always connected to the input of an I/O or output group with
the lowest index. The remaining output lines OUT1 to OUT7 are connected to the I/O
or Output lines with ascending index.
Example: for OMG13 (see Figure 24-62), the outputs OUT0 to OUT7 are wired (via
OMG03) to input lines 0 to 7 of I/O group 3 (IOG3).
• One input of an I/O or output group can be connected to the output of only one timer
cell. This is guaranteed by the OMG control register layout. Otherwise, short circuits
and unpredictable behavior would occur. On the other hand, it is permissible for the
output of a GTC or LTC to be connected to more than one input of an I/O or output
group.
MCA05972
From other OMGs
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
Outputs of a
LTC Group or
GTC Group
To other
OMGs
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
To I/O or Output Groups
More than one switch
might be closed per row,
only one switch can be
closed per column
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