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SST89E516RD2 Fiches technique(PDF) 71 Page - Microchip Technology |
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SST89E516RD2 Fiches technique(HTML) 71 Page - Microchip Technology |
71 / 94 page ©2013 Silicon Storage Technology, Inc. DS25093B 02/13 71 FlashFlex MCU SST89E516RD2 / SST89E516RD SST89V516RD2 / SST89V516RD Data Sheet System Clock and Clock Options Clock Input Options and Recommended Capacitor Values for Oscillator Shown in Figure 33 are the input and output of an internal inverting amplifier (XTAL1, XTAL2), which can be configured for use as an on-chip oscillator. When driving the device from an external clock source, XTAL2 should be left disconnected and XTAL1 should be driven. At start-up, the external oscillator may encounter a higher capacitive load at XTAL1 due to interaction between the amplifier and its feedback capacitance. However, the capacitance will not exceed 15 pF once the external signal meets the VIL and VIH specifications. Crystal manufacturer, supply voltage, and other factors may cause circuit performance to differ from one application to another. C1 and C2 should be adjusted appropriately for each design. Table 29, shows the typical values for C1 and C2 vs. crystal type for various frequencies More specific information about on-chip oscillator design can be found in the FlashFlex Oscillator Circuit Design Considerations application note. Clock Doubling Option By default, the device runs at 12 clocks per machine cycle (x1 mode). The device has a clock doubling option to speed up to 6 clocks per machine cycle. Please refer to Table 30 for detail. Clock double mode can be enabled either via the external host mode or the IAP mode. Please refer to Table 14 for the IAP mode enabling commands (When set, the EDC# bit in SFST register will indicate 6 clock mode.). The clock double mode is only for doubling the internal system clock and the internal flash memory, i.e. EA#=1. To access the external memory and the peripheral devices, careful consideration must be taken. Also note that the crystal output (XTAL2) will not be doubled. Table 29: Recommended Values for C1 and C2 by Crystal Type Crystal C1 = C2 Quartz 20-30pF Ceramic 40-50pF T0-0.0 25093 |
Numéro de pièce similaire - SST89E516RD2_13 |
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Description similaire - SST89E516RD2_13 |
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