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TC1784
General Purpose Timer Array (GPTA
®
v5)
User´s Manual
21-239
V1.1, 2011-05
GPTA
®
v5, V1.14
Otherwise, short circuits and unpredictable behavior would occur. In contrast, it is
permitted that an I/O group output, or to a clock bus output, or a PDL/INT output is
connected to more than one LTC input.
The LTC input multiplexer group configuration is based on the following principles:
•
Each LIMG is referenced with two index variables: n and g (LIMGng)
•
Index n is a group number. I/O groups IOG[3:0] have group number 0, I/O group
IOG4 is not implemented, clock bus lines CLK[7:0] have group number 3, and the
PDL/INT group has group number 4.
•
Index g indicates the number of the LTC group g (g = 0-3) to which the outputs of the
input multiplexer group LIMGng are connected.
The LTC input multiplexer logic as seen for programming is shown in
. With
this logic, three group signals (from I/O groups, clock group, or PDL/INT group) are
always combined to one output line that leads to an LTC input of LTC group g. For
example, when looking at
, each of the eight LTC input multiplexer output
lines to LTC group LTCG2 is connected via three LIMGn2 (n = 0, 3, 4) to the eight
outputs of I/O group IOG2, the clock group, and the PDL/INT group.
Figure 21-89 LTC Input Multiplexer (Programmer’s View)
The 1. level multiplexer is built up by four three 8:1 multiplexers that are controlled in
parallel by bit field LIMLn. The output of the multiplexer is connected only to the input of
an LTC if bit LIMENn is set (enable multiplexer connection), and bit MRACTL.AEN is set
(multiplexer array enabled), and no reserved bit combination is selected. If one of these
conditions is not true, the corresponding LTC input will be held at a low level.
MCA05991_LTC32.VSD
MUX
I/O Group
(LIMG0g)
MUX
001
000
2. Level
Mux
LIMLn
LIMGn
1. Level
Mux
LIMCRLg
LIMCRHg
(g = 0-3)
To Input n of
LTC Group g
MU
X
011
100
Clock Group
(LIMG3g)
FPC/INT
Group
(LIMG4g)
MU
X
LIMENn
0
MU
X
0
1
MAEN
MRACTL
Registers
&
Not a reserved
LIMGn bit combination
8
3
3
8
8
Reserved
Содержание TC1784
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