4.2.149 PCTIMER Register (Offset = 0x904) [reset = 0xFF]
16/32-Bit General-Purpose Timer Power Control (PCTIMER)
NOTE
The Timer module does not currently provide the ability to respond to the power-down request. Setting a bit in this register has no effect on power consumption. This register is defined for future software compatibility.
The PCTIMER register controls the power applied to the Timer module. The function of this bit depends on the current state of the device (run, sleep or deep-sleep mode) and value of the corresponding bits in the RCGCTIMER, SCGCTIMER, and DCGCTIMER registers. If the Rn, Sn, or Dn bit of the respective RCGCTIMER, SCGCTIMER, and DCGCTIMER registers is 1 and the device is in that mode, the module is powered and receives a clock regardless of the corresponding Pn bit in the PCTIMER register.
However, if the Rn, Sn, or Dn bit of the respective RCGCTIMER, SCGCTIMER, and DCGCTIMER registers is 0 and the device is in that mode, then the module behaves differently depending on the value of the corresponding Pn bit in the PCTIMER register. In this case, when the Pn bit is clear, the module is not powered and does not receive a clock. If the Pn bit is set, the module is powered but does not receive a clock. Table 4-163 details the differences.
Table 4-163 Module Power Control
| Rn, Sn, or Dn Value in Respective RCGCx, SCGCx, or DCGCx Register |
Pn |
Description |
| 0 |
0 |
Module is not powered and does not receive a clock. In this case, the state of the peripheral is not retained.
This is the lowest power consumption state of any peripheral, because it consumes no dynamic nor leakage current. Hardware should perform a peripheral reset if the active mode changes and the RCGCx, SCGCx, or DCGCx register is 1 or the P0 bit is changed to 1.
Software must reinitialize the peripheral when reenabled due to the loss of state.
|
| 0 |
1 |
Module is powered but does not receive a clock.
In this case, the peripheral is inactive. This is the second-lowest power consumption of any peripheral, because it consumes only leakage current.
|
| 1 |
X |
Module is powered and receives a clock. |
PCTIMER is shown in Figure 4-155 and described in Table 4-164.
Return to Summary Table.
Figure 4-155 PCTIMER Register
| 31 |
30 |
29 |
28 |
27 |
26 |
25 |
24 |
23 |
22 |
21 |
20 |
19 |
18 |
17 |
16 |
| RESERVED |
| R-0x0 |
|
| 15 |
14 |
13 |
12 |
11 |
10 |
9 |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
| RESERVED |
P7 |
P6 |
P5 |
P4 |
P3 |
P2 |
P1 |
P0 |
| R-0x0 |
R/W-0x1 |
R/W-0x1 |
R/W-0x1 |
R/W-0x1 |
R/W-0x1 |
R/W-0x1 |
R/W-0x1 |
R/W-0x1 |
|
Table 4-164 PCTIMER Register Field Descriptions
| Bit |
Field |
Type |
Reset |
Description |
| 31-8 |
RESERVED |
R |
0x0 |
|
| 7 |
P7 |
R/W |
0x1 |
General-Purpose Timer 7 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 7 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 7 module is powered but does not receive a clock. In this case, the module is inactive.
|
| 6 |
P6 |
R/W |
0x1 |
General-Purpose Timer 6 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 6 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 6 module is powered but does not receive a clock. In this case, the module is inactive.
|
| 5 |
P5 |
R/W |
0x1 |
General-Purpose Timer 5 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 5 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 5 module is powered but does not receive a clock. In this case, the module is inactive.
|
| 4 |
P4 |
R/W |
0x1 |
General-Purpose Timer 4 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 4 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 4 module is powered but does not receive a clock. In this case, the module is inactive.
|
| 3 |
P3 |
R/W |
0x1 |
General-Purpose Timer 3 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 3 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 3 module is powered but does not receive a clock. In this case, the module is inactive.
|
| 2 |
P2 |
R/W |
0x1 |
General-Purpose Timer 2 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 2 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 2 module is powered but does not receive a clock. In this case, the module is inactive.
|
| 1 |
P1 |
R/W |
0x1 |
General-Purpose Timer 1 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 1 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 1 module is powered but does not receive a clock. In this case, the module is inactive.
|
| 0 |
P0 |
R/W |
0x1 |
General-Purpose Timer 0 Power Control. The Pn bit encodings do not apply if the corresponding bit in the RCGCTIMER, SCGCTIMER or DCGCTIMER register is clear.
0x0 = Timer 0 module is not powered and does not receive a clock. In this case, the state of the module is not retained. This configuration provides the lowest power consumption state.
0x1 = Timer 0 module is powered but does not receive a clock. In this case, the module is inactive.
|