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HC05 датащи(PDF) 39 Page - Motorola, Inc |
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HC05 датащи(HTML) 39 Page - Motorola, Inc |
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39 / 232 page ![]() MC68HC05X16 Rev. 1 MOTOROLA 2-15 MODES OF OPERATION AND PIN DESCRIPTIONS 2 2.3.12.4 Oscillator division The external oscillator can run up to 22MHz. For this reason an additional clock predivider is provided; its division ratio is selected via a mask option (see Section 1.2). This allows a CPU clock two, four, eight or ten times slower than the external clock, provided that SLOW mode has not been entered. If the device is in SLOW mode, a further divide-by-16 oscillator predivider reduces the CPU clock frequency to a frequency 32, 64, 128 or 160 times slower than the oscillator clock. The MCAN is directly clocked with the external oscillator frequency divided by two. A block diagram of the oscillator divider circuit is given in Figure 2-7. 2.3.13 PLMA The PLMA pin is the output of pulse length modulation converter A. 2.3.14 PLMB The PLMB pin is the output of pulse length modulation converter B. Figure 2-7 Oscillator divider block diagram OSC1 pin OSC2 pin Oscillator MCAN module ÷ 16 Control logic ÷ 2 SM bit ÷1, ÷2, ÷4, or ÷5 fOSC/2, /4, /8 or /10 fOSC/32, /64, /128 or /160 MCAN clock Main internal clock Mask option ÷ 2 37 |
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