XC886/888CLM
Capture/Compare Unit 6
User’s Manual
14-12
V1.3, 2010-02
CCU6, V 1.0
14.1.2
Timer T13
The timer T13 is similar to timer T12, except that it has only one channel in compare
mode. The counter can only count up (similar to the edge-aligned mode of T12). The
input clock for timer T13 can be from
f
CCU6
to a maximum of
f
CCU6
/128 and is configured
by bit field T13CLK. In order to support higher clock frequencies, an additional prescaler
factor of 1/256 can be enabled for the prescaler of T13 if bit T13PRE = 1.
The T13 shadow transfer, in case of a period-match, is enabled by bit STE13. During the
T13 shadow transfer, the contents of register CC63SR are transferred to register
CC63R. Both registers can be read by software, while only the shadow register can be
written by software.
The bits CC63PS, T13IM and PSL63 have shadow bits. The contents of these shadow
bits are transferred to the actually used bits during the T13 shadow transfer. Write
actions target the shadow bits, while read actions deliver the value of the actually used
bits.
Figure 14-9
T13 Overview
Timer T13 counts according to the same counting and switching rules as timer T12 in
edge-aligned mode.
shows an overview of Timer T13.
14.1.2.1
Timer Configuration
Register T13 represents the counting value of timer T13. It can be written only while the
timer T13 is stopped. Write actions are not taken into account while T13 is running.
Register T13 can always be read by software. Timer T13 supports only edge-aligned
mode (counting up).
Timer T13 can be started and stopped by using bit T13R by hardware or software.
CC63R
CC63SR
= ?
counter
register T13
compare-match
= 0 ?
zero-match
T13PR
T13PS
= ?
T13 shadow transfer
period-match
T13clk
16
16
16
CCU6_t13_overv
*
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