MC9S08JM8CLD Freescale Semiconductor, MC9S08JM8CLD Datasheet - Page 199
![MCU 8BIT 8K FLASH 44-LQFP](/photos/37/61/376114/lqfp-44_sml.jpg)
MC9S08JM8CLD
Manufacturer Part Number
MC9S08JM8CLD
Description
MCU 8BIT 8K FLASH 44-LQFP
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.DEMO9S08JM16.pdf
(386 pages)
Specifications of MC9S08JM8CLD
Core Processor
HCS08
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, LIN, SCI, SPI, USB
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x12b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-LQFP
Processor Series
S08JM
Core
HCS08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
I2C, SPI
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
37
Number Of Timers
2
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
DEMOJM, DEMOJMSKT, DEMOFLEXISJMSD, DEMO9S08JM16
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit, 8 Channel
Controller Family/series
HCS08
No. Of I/o's
33
Ram Memory Size
1KB
Cpu Speed
48MHz
No. Of Timers
2
Digital Ic Case Style
LQFP
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC9S08JM8CLD
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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12.5.2.2
In this example, the MCG will move through the proper operational modes from PEE mode with a 4 MHz
crystal configured for an 8 MHz bus frequency (see previous example) to BLPI mode with a 16 kHz bus
frequency.First, the code sequence will be described. Then a flowchart will be included which illustrates
the sequence.
Freescale Semiconductor
1. First, PEE must transition to PBE mode:
2. Then, PBE must transition either directly to FBE mode or first through BLPE mode and then to
3. Next, FBE mode transitions into FBI mode:
a) MCGC1 = 0x90 (%10010000)
b) Loop until CLKST (bits 3 and 2) in MCGSC are %10, indicating that the external reference
FBE mode:
a) BLPE: If a transition through BLPE mode is desired, first set LP (bit 3) in MCGC2 to 1
b) BLPE/FBE: MCGC1 = 0xB8 (%10111000)
c) BLPE/FBE: MCGC3 = 0x04 (%00000100)
d) BLPE: If transitioning through BLPE mode, clear LP (bit 3) in MCGC2 to 0 here to switch to
e) FBE: Loop until PLLST (bit 5) in MCGSC is clear, indicating that the current source for the
f) FBE: Optionally, loop until LOCK (bit 6) in the MCGSC is set, indicating that the FLL has
a) MCGC1 = 0x44 (%01000100)
b) Loop until IREFST (bit 4) in MCGSC is 1, indicating the internal reference clock has been
c) Loop until CLKST (bits 3 and 2) in MCGSC are %01, indicating that the internal reference
– CLKS (bits 7 and 6) set to %10 in order to switch the system clock source to the external
clock is selected to feed MCGOUT
– RDIV (bits 5-3) set to %111, or divide-by-128 because 4 MHz / 128 = 31.25 kHz which is
– PLLS (bit 6) clear to 0 to select the FLL. In BLPE mode, changing this bit only prepares the
FBE mode
PLLS clock is the FLL
acquired lock. Although the FLL is bypassed in FBE mode, it is still enabled and running.
– CLKS (bits7 and 6) in MCGSC1 set to %01 in order to switch the system clock to the
– IREFS (bit 2) set to 1 to select the internal reference clock as the reference clock source
– RDIV (bits 5-3) set to %000, or divide-by-1 because the trimmed internal reference must be
selected as the reference clock source
clock is selected to feed MCGOUT
Example # 2: Moving from PEE to BLPI Mode: External Crystal = 4 MHz,
Bus Frequency =16 kHz
reference clock
in the 31.25 kHz to 39.0625 kHz range required by the FLL. In BLPE mode, the
configuration of the RDIV does not matter because both the FLL and PLL are disabled.
Changing them only sets up the dividers for FLL usage in FBE mode
MCG for FLL usage in FBE mode. With PLLS = 0, the VDIV value does not matter.
internal reference clock
within the 31.25 kHz to 39.0625 kHz range required by the FLL
MC9S08JM16 Series Data Sheet, Rev. 2
Multi-Purpose Clock Generator (S08MCGV1)
199
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