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Triple Timer Module Programming Model
Table 9-1. Timer Prescaler Load Register (TPLR) Bit Definitions
Bit Number
23
22–21
Bit Name
PS[1–0]
Reset Value
0
0
Description
Reserved. Write to zero for future compatibility.
Prescaler Source
Control the source of the prescaler clock. The prescaler’s use of a TIO signal
is not affected by the TCSR settings of the timer of the corresponding TIO
signal. If the prescaler source clock is external, the prescaler counter is
incremented by signal transitions on the TIO signal. The external clock is
internally synchronized to the internal clock. The external clock frequency
must be lower than the DSP56311 internal operating frequency divided by 4
(that is, CLK/4).
Note:
To ensure proper operation, change the PS[1–0] bits only when the
prescaler counter is disabled. Disable the prescaler counter by
clearing TCSR[TE] of each of three timers.
PS1
0
0
1
1
PS0
0
1
0
1
Prescaler Clock Source
Internal CLK/2
TIO0
TIO1
TIO2
20–0
PL[20–0]
0
Prescaler Preload Value
Contains the prescaler preload value, which is loaded into the prescaler
counter when the counter value reaches 0 or the counter switches state from
disabled to enabled. If PL[20–0] = N, then the prescaler counts N+1 source
clock cycles before generating a prescaler clock pulse. Therefore, the
prescaler divide factor = (preload value) + 1.
9.4.3 Timer Prescaler Count Register (TPCR)
The TPCR is a read-only register that reflects the current value in the prescaler counter.
23
22
21
20
19
18
17
16
15
14
13
12
PC20
PC19
PC18
PC17
PC16
PC15
PC14
PC13
PC12
11
PC11
10
PC10
9
PC9
8
PC8
7
PC7
6
PC6
5
PC5
4
PC4
3
PC3
2
PC2
1
PC1
0
PC0
Reserved bit; read as 0; write to 0 for future compatibility
Figure 9-22. Timer Prescaler Count Register (TPCR)
Table 9-2. Timer Prescaler Count Register (TPCR) Bit Definitions
Bit Number
23–21
20–0
Bit Name
PC[20–0]
Reset Value
0
0
Description
Reserved. Write to zero for future compatibility.
Prescaler Counter Value
Contain the current value of the prescaler counter.
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
9-23
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