S3S12HZ256J3CAA FREESCALE [Freescale Semiconductor, Inc], S3S12HZ256J3CAA Datasheet - Page 79

• Manufacturer Part Number: S3S12HZ256J3CAA
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Freescale Semiconductor
TRY TO DECREASE Tbus
Figure 2-22. Determination Procedure for PRDIV8 and FDIV Bits
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
MC9S12HZ256 Data Sheet, Rev. 2.04
PRDIV8=0 (reset)
FCLK > 0.15 MHz
FDIV[5:0] > 4?
OSCILLATOR
Tbus < 1 s?
> 12.8 MHZ?
an integer?
PRDIV8=1
START
CLOCK
AND
?
YES
YES
YES
NO
NO
NO
NO
PRDCLK=oscillator_clock
YES
NO
FDIV[5:0]=INT(PRDCLK[MHz]*(5+Tbus[ s]))
ALL COMMANDS IMPOSSIBLE
Chapter 2 256 Kbyte Flash Module (FTS256K2V1)
END
79