Timers Programming Model
MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
22-13
CYC
31
0
Cyclic/One-Shot
Defines whether the Timer Ax mode of operation is cyclic or
one-shot. In One-Shot mode, the counter of Timer-n counts up
until it equals the TCMPAx[COMPVAL] field and then stops
counting.
Note:
There are only two ways to use a timer properly in
one-shot mode:
1.
Set the one-shot timer input clock to be the bus
clock.
2.
The one-shot timer input clock must be higher than
the bus clock frequency divided by 4.
In Cyclic mode, the counter of Timer-n counts from 0 until
TCMPA[COMPVAL], wraps back to 0 and continues counting.
0
One-Shot mode.
1
Cyclic mode.
Notes: 1.
IPOL in TCFRAx has no effect if the bus clock is used. The counter counts on the positive edge.
2.
If an external clock is selected, you configure the GPIO registers. If an external input clock, TDM0RCLK or
TDM1RCLK, is selected as an input clock, the corresponding signal line should be configured by the TDM
registers as an input clock via the GPIO, in addition to configuring the GPIO registers (see Chapter 20, TDM
Interface and Chapter 23, GPIO).
Table 22-8. TCFRA[0–15] Bit Descriptions (Continued)
Name
Reset
Description
Settings
Содержание MSC8113
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