mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 179

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

11.7 System Clock Frequency formulas
MC68HC912DG128 — Rev 3.0
MOTOROLA
NOTE:
See
SLWCLK = EXTALi / ( 2 x SLOW )
SLWCLK = EXTALi
PLLCLK = 2 x EXTALi x (SYNR + 1) / (REFDV + 1)
ECLK = SYSCLK / 2
XCLK = SLWCLK / 2
PCLK = SYSCLK / 2
BCLK
Boolean equations:
SYSCLK = (BCSP & PLLCLK) | (BCSP & BCSS & EXTALi) | (BCSP &
BCSS & SLWCLK)
MCLK = (PCLK & MCS) | (XCLK & MCS)
MSCAN system = (EXTALi & CLKSRC) | (SYSCLK & CLKSRC)
BDM system = (BCLK & CLKSW) | (ECLK & CLKSW)
During limp-home mode PCLK, ECLK, BCLK, MCLK and XCLK are
supplied by VCO (PLLCLK).
1. If SYSCLK is slower than EXTALi (BCSS=1, BCSP=0, SLOW>0), BCLK becomes ECLK.
Freescale Semiconductor, Inc.
Figure
For More Information On This Product,
(1)
= EXTALi / 2
11-6:
Go to: www.freescale.com
Clock Functions
System Clock Frequency formulas
SLOW = 1,2,..63
SLOW = 0
Clock Functions
Technical Data
179