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MC68HC908GR4MP Datasheet(PDF) 81 Page - Freescale Semiconductor, Inc |
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MC68HC908GR4MP Datasheet(HTML) 81 Page - Freescale Semiconductor, Inc |
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81 / 286 page  CGMC Registers MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7 Freescale Semiconductor 81 if the PLL is off. Therefore, PLLON cannot be cleared when BCS is set, and BCS cannot be set when PLLON is clear. If the PLL is off (PLLON = 0), selecting CGMVCLK requires two writes to the PLL control register. (See 7.3.8 Base Clock Selector Circuit.) PRE1 and PRE0 — Prescaler Program Bits These read/write bits control a prescaler that selects the prescaler power-of-two multiplier, P. (See 7.3.3 PLL Circuits and 7.3.6 Programming the PLL.) PRE1 and PRE0 cannot be written when the PLLON bit is set. Reset clears these bits. NOTE The value of P is normally 0 when using a 32.768-kHz crystal as the reference. VPR1 and 0 — VCO Power-of-Two Range Select Bits These read/write bits control the VCO’s hardware power-of-two range multiplier E that, in conjunction with L (See 7.3.3 PLL Circuits, 7.3.6 Programming the PLL, and 7.5.5 PLL VCO Range Select Register.) controls the hardware center-of-range frequency, fVRS. VPR1:VPR0 cannot be written when the PLLON bit is set. Reset clears these bits. Table 7-2. PRE 1 and PRE0 Programming PRE1 and PRE0 P Prescaler Multiplier 00 0 1 01 1 2 10 2 4 11 3 8 Table 7-3. VPR1 and VPR0 Programming VPR1 and VPR0 E VCO Power-of-Two Range Multiplier 00 0 1 01 1 2 10 2 4 11 3(1) 1. Do not program E to a value of 3. 8 |
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