mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 482

• Manufacturer Part Number: mc9s12q128
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 17 32 Kbyte Flash Module (S12FTS32KV1)
482
TRY TO DECREASE Tbus
Figure 17-21. PRDIV8 and FDIV Bits Determination Procedure
FDIV[5:0]=PRDCLK[MHz]*(5+Tbus[ms])-1
yes
ALL COMMANDS IMPOSSIBLE
FCLK=(PRDCLK)/(1+FDIV[5:0])
PRDCLK[MHz]*(5+Tbus[ms])
1/FCLK[MHz] + Tbus[ms] > 5
PRDCLK=oscillator_clock/8
PRDIV8=0 (reset)
FCLK > 0.15MHz
oscillator_clock
FDIV[5:0] > 4?
Tbus < 1ms?
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[ms]))
ALL COMMANDS IMPOSSIBLE
END
Freescale Semiconductor