Information

Table 46-88. Delay Values
Delay Prescaler Values
1 3 5 7
Delay Scaler Values
2 20.0 ns 60.0 ns 100.0 ns 140.0 ns
4 40.0 ns 120.0 ns 200.0 ns 280.0 ns
8 80.0 ns 240.0 ns 400.0 ns 560.0 ns
16 160.0 ns 480.0 ns 800.0 ns 1.1 μs
32 320.0 ns 960.0 ns 1.6 μs 2.2 μs
64 640.0 ns 1.9 μs 3.2 μs 4.5 μs
128 1.3 μs 3.8 μs 6.4 μs 9.0 μs
256 2.6 μs 7.7 μs 12.8 μs 17.9 μs
512 5.1 μs 15.4 μs 25.6 μs 35.8 μs
1024 10.2 μs 30.7 μs 51.2 μs 71.7 μs
2048 20.5 μs 61.4 μs 102.4 μs 143.4 μs
4096 41.0 μs 122.9 μs 204.8 μs 286.7 μs
8192 81.9 μs 245.8 μs 409.6 μs 573.4 μs
16384 163.8 μs 491.5 μs 819.2 μs 1.1 ms
32768 327.7 μs 983.0 μs 1.6 ms 2.3 ms
65536 655.4 μs 2.0 ms 3.3 ms 4.6 ms
46.5.5 Calculation of FIFO Pointer Addresses
Complete visibility of the TX and RX FIFO contents is available through the FIFO
registers, and valid entries can be identified through a memory mapped pointer and a
memory mapped counter for each FIFO. The pointer to the first-in entry in each FIFO is
memory mapped. For the TX FIFO the first-in pointer is the Transmit Next Pointer
(TXNXTPTR). For the RX FIFO the first-in pointer is the Pop Next Pointer
(POPNXTPTR). The following figure illustrates the concept of first-in and last-in FIFO
entries along with the FIFO Counter. The TX FIFO is chosen for the illustration, but the
concepts carry over to the RX FIFO. See Transmit First In First Out (TX FIFO) Buffering
Mechanism and Receive First In First Out (RX FIFO) Buffering Mechanism for details
on the FIFO operation.
Chapter 46 SPI (DSPI)
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 1253