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PC312XDP512F0CFVR Datasheet(PDF) 1051 Page - Freescale Semiconductor, Inc |
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PC312XDP512F0CFVR Datasheet(HTML) 1051 Page - Freescale Semiconductor, Inc |
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1051 / 1348 page  Chapter 25 2 Kbyte EEPROM Module (S12XEETX2KV1) MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 1053 Figure 25-17. Determination Procedure for PRDIV8 and EDIV Bits PRDIV8 = 1 yes no PRDIV8 = 0 (reset) >12.8 MHz? EECLK = (PRDCLK)/(1+EDIV[5:0]) PRDCLK = oscillator_clock PRDCLK = oscillator_clock/8 PRDCLK[MHz]*(5+Tbus[ µs]) no EDIV[5:0]=PRDCLK[MHz]*(5+Tbus[ µs])–1 yes START Tbus < 1 µs? an integer? EDIV[5:0]=INT(PRDCLK[MHz]*(5+Tbus[ µs])) 1/EECLK[MHz] + Tbus[ms] > 5 AND EECLK > 0.15 MHz ? END yes no EDIV[5:0] > 4? ALL COMMANDS IMPOSSIBLE yes no ALL COMMANDS IMPOSSIBLE no TRY TO DECREASE Tbus yes oscillator_clock |
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