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MC68332GCFC16 Datasheet(PDF) 59 Page - Freescale Semiconductor, Inc |
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MC68332GCFC16 Datasheet(HTML) 59 Page - Freescale Semiconductor, Inc |
59 / 88 page MC68332 MOTOROLA MC68332TS/D 59 TCR1P — Timer Count Register 1 Prescaler Control TCR1 is clocked from the output of a prescaler. The prescaler's input is the internal TPU system clock divided by either 4 or 32, depending on the value of the PSCK bit. The prescaler divides this input by 1, 2, 4, or 8. Channels using TCR1 have the capability to resolve down to the TPU system clock divided by 4. TCR2P — Timer Count Register 2 Prescaler Control TCR2 is clocked from the output of a prescaler. If T2CG = 0, the input to the TCR2 prescaler is the ex- ternal TCR2 clock source. If T2CG = 1, the input is the TPU system clock divided by eight. The TCR2P field specifies the value of the prescaler: 1, 2, 4, or 8. Channels using TCR2 have the capability to re- solve down to the TPU system clock divided by 8. The following table is a summary of prescaler output. PSCK = 0 PSCK = 1 TCR1 Prescaler Divide By Number of Clocks Rate at 16 MHz Number of Clocks Rate at 16 MHz 00 1 32 2 ms 4 250 ns 01 2 64 4 ms 8 500 ns 10 4 128 8 ms 16 1 ms 11 8 256 16 ms 32 2 ms TCR2 Prescaler Divide By Internal Clock Divided By External Clock Divided By 00 181 012162 104324 118648 TCR1 015 PSCK MUX ÷ 4 DIV4 CLOCK ÷ 32 DIV32 CLOCK TCR1 PRESCALER 00 ÷ 1 01 ÷ 2 10 ÷ 4 11 ÷ 8 SYSTEM CLOCK 1 – DIV4 0 – DIV32 PRESCALER CTL BLOCK 1 PRESCALER CTL BLOCK 2 DIGITAL FILTER EXTERNAL TCR2 PIN TCR2 (T2CG CONTROL BIT) 0 – A 1 – B 015 A B MUX CONTROL TCR2 PRESCALER 00 ÷ 1 01 ÷ 2 10 ÷ 4 11 ÷ 8 INT CLK /8 SYNCHRONIZER Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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