MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 584
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MC9S12Q
Manufacturer Part Number
MC9S12Q
Description
Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12Q.pdf
(644 pages)
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Chapter 20 128 Kbyte Flash Module (S12FTS128K1V1)
584
TRY TO DECREASE Tbus
Figure 20-21. PRDIV8 and FDIV Bits Determination Procedure
FDIV[5:0]=PRDCLK[MHz]*(5+Tbus[ s])-1
yes
ALL COMMANDS IMPOSSIBLE
FCLK=(PRDCLK)/(1+FDIV[5:0])
PRDCLK[MHz]*(5+Tbus[ s])
1/FCLK[MHz] + Tbus[ s] > 5
PRDCLK=oscillator_clock/8
PRDIV8=0 (reset)
FCLK > 0.15MHz
oscillator_clock
FDIV[5:0] > 4?
Tbus < 1 s?
an integer?
PRDIV8=1
START
12.8MHz?
AND
?
yes
yes
yes
no
no
MC9S12Q128
Rev 1.09
no
no
PRDCLK=oscillator_clock
no
yes
FDIV[5:0]=INT(PRDCLK[MHz]*(5+Tbus[ s]))
ALL COMMANDS IMPOSSIBLE
END
Freescale Semiconductor
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