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MC9S12XD256MAL Datasheet, PDF (546/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network | |||
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Chapter 13 Periodic Interrupt Timer (S12PIT24B4CV1)
13.3.0.2 PIT Force Load Timer Register (PITFLT)
7
6
5
4
R
0
0
0
0
W
Reset
0
0
0
0
= Unimplemented or Reserved
3
0
PFLT3
0
2
0
PFLT2
0
Figure 13-4. PIT Force Load Timer Register (PITFLT)
Read: Anytime
Write: Anytime; writes to the reserved bits have no effect
Table 13-2. PITFLT Field Descriptions
1
0
PFLT1
0
0
0
PFLT0
0
Field
Description
3:0
PFLT[3:0]
PIT Force Load Bits for Timer 3-0 â These bits have only an effect if the corresponding timer channel (PCE
set) is enabled and if the PIT module is enabled (PITE set). Writing a one into a PFLT bit loads the corresponding
16-bit timer load register into the 16-bit timer down-counter. Writing a zero has no effect. Reading these bits will
always return zero.
13.3.0.3 PIT Channel Enable Register (PITCE)
7
6
5
4
R
0
0
0
0
W
Reset
0
0
0
0
= Unimplemented or Reserved
3
PCE3
0
2
PCE2
0
Figure 13-5. PIT Channel Enable Register (PITCE)
Read: Anytime
Write: Anytime; writes to the reserved bits have no effect
Table 13-3. PITCE Field Descriptions
1
PCE1
0
0
PCE0
0
Field
3:0
PCE[3:0]
Description
PIT Enable Bits for Timer Channel 3:0 â These bits enable the PIT channels 3-0. If PCE is cleared, the PIT
channel is disabled and the corresponding ï¬ag bit in the PITTF register is cleared. When PCE is set, and if the
PIT module is enabled (PITE = 1) the 16-bit timer counter is loaded with the start count value and starts
down-counting.
0 The corresponding PIT channel is disabled.
1 The corresponding PIT channel is enabled.
MC9S12XDP512 Data Sheet, Rev. 2.21
546
Freescale Semiconductor
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