MSC8144E Reference Manual, Rev. 3
21-18
Freescale
Semiconductor
Timers
PCS
12–9
0
Primary Count Source
Select the primary count source. A timer
selecting its own output for input is not a legal
choice. The result is no counting.
0000 Timer 0 input signal.
0001 Timer 1 input signal.
0010 Timer 2 input signal.
0011 Timer 3 input signal.
0100 Timer 0 output for cascaded timer
operation.
0101 Timer 1 output for cascaded timer
operation.
0110 Timer 2 output for cascaded timer
operation.
0111
Timer 3 output for cascaded timer
operation.
1000
Prescaler (CLASS64 clock/1).
1001 Prescaler
(CLASS64
clock/2).
1010 Prescaler
(CLASS64
clock/4).
1011 Prescaler (CLASS64 clock/ 8).
1100 Prescaler
(CLASS64
clock/16).
1101 Prescaler
(CLASS64
clock/32).
1110 Prescaler
(CLASS64
clock/64).
1111 Prescaler
(CLASS64
clock/128).
SC
8–7
0
Secondary Count Source
Provides additional information, such as
direction, used for counting. These bits also
define the source used by both the Capture
mode bits and the input Edge Flag in the Timer
Channel Status and Control register. The Timer
n input signals are inputs of the timers in the
quad timer module.
00
Timer 0
input signal.
01
Timer 1
input signal.
10
Timer 2
input signal.
11
Timer 3
input signal.
ONCE
6
0
Count Once
Selects continuous or one-shot counting. If
counting up, a successful compare occurs when
the timer reaches TMRxCMP1 value. If counting
down, a successful compare occurs when a
timer reaches TMRxCMP2 value.
0 Count
repeatedly.
1
Count to the compare value and then
stop.
LEN
5
0
Count Length
Determines whether the timer counts to the
compare value and then reinitializes itself, or
the timer continues counting past the compare
value (binary roll-over). If counting up, a
successful compare occurs when the timer
reaches the TMRxCMP1 value. If counting
down, a successful compare occurs when the
timer reaches the TMRxCMP2 value.
0 Roll-over.
1
Count to the compare value and then
reinitialize.
DIR
4
0
Count Direction
Selects either the normal count up direction, or
the reverse down direction.
0 Count up.
1 Count down.
Table 21-4. TMR[0–3]CTL[0–3] Bit Descriptions (Continued)
Name
Reset
Description
Settings
Содержание MSC8144E
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