MC9S08JM60CLH Freescale, MC9S08JM60CLH Datasheet - Page 199
MC9S08JM60CLH
Manufacturer Part Number
MC9S08JM60CLH
Description
Manufacturer
Freescale
Datasheet
1.MC9S08JM60CLH.pdf
(388 pages)
Specifications of MC9S08JM60CLH
Cpu Family
HCS08
Device Core Size
8b
Frequency (max)
24MHz
Interface Type
SCI/SPI
Total Internal Ram Size
4KB
# I/os (max)
51
Number Of Timers - General Purpose
8
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
12-chx12-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
64
Package Type
LQFP
Program Memory Type
Flash
Program Memory Size
60KB
Lead Free Status / RoHS Status
Compliant
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To change from FEI clock mode to FBI clock mode, follow this procedure:
12.5.2
When switching between operational modes of the MCG, certain configuration bits must be changed in
order to properly move from one mode to another. Each time any of these bits are changed (PLLS, IREFS,
CLKS, or EREFS), the corresponding bits in the MCGSC register (PLLST, IREFST, CLKST, or
OSCINIT) must be checked before moving on in the application software.
Additionally, care must be taken to ensure that the reference clock divider (RDIV) is set properly for the
mode being switched to. For instance, in PEE mode, if using a 4 MHz crystal, RDIV must be set to %001
(divide-by-2) or %010 (divide -by-4) in order to divide the external reference down to the required
frequency between 1 and 2 MHz.
The RDIV and IREFS bits should always be set properly before changing the PLLS bit so that the FLL or
PLL clock has an appropriate reference clock frequency to switch to.
Freescale Semiconductor
3. After the proper configuration bits have been set, wait for the affected bits in the MCGSC register
1. Change the CLKS bits to %01 so that the internal reference clock is selected as the system clock
2. Wait for the CLKST bits in the MCGSC register to change to %01, indicating that the internal
to be changed appropriately, reflecting that the MCG has moved into the proper mode.
— If ERCLKEN was set in step 1 or the MCG is in FEE, FBE, PEE, PBE, or BLPE mode, and
— If in FEE mode, check to make sure the IREFST bit is cleared and the LOCK bit is set before
— If in FBE mode, check to make sure the IREFST bit is cleared, the LOCK bit is set, and the
source.
reference clock has been appropriately selected.
minimum power consumption, leave the internal reference disabled while in an external clock
mode.
EREFS was also set in step 1, wait here for the OSCINIT bit to become set indicating that the
external clock source has finished its initialization cycles and stabilized. Typical crystal startup
times are given in Appendix A, “Electrical Characteristics”.
moving on.
CLKST bits have changed to %10 indicating the external reference clock has been
appropriately selected. Although the FLL is bypassed in FBE mode, it is still on and will lock
in FBE mode.
MCG Mode Switching
MC9S08JM60 Series Data Sheet, Rev. 3
Multi-Purpose Clock Generator (S08MCGV1)
199
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