MC9S08GB60CFU Freescale Semiconductor, MC9S08GB60CFU Datasheet - Page 113
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MC9S08GB60CFU
Manufacturer Part Number
MC9S08GB60CFU
Description
IC MCU 60K FLASH 20MHZ 64-LQFP
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.M68EVB908GB60E.pdf
(290 pages)
Specifications of MC9S08GB60CFU
Core Processor
HCS08
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
56
Program Memory Size
60KB (60K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-LQFP
For Use With
M68DEMO908GB60E - BOARD DEMO MC9S08GB60M68EVB908GB60E - BOARD EVAL FOR MC9S08GB60
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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7.4.3
In this example, the FLL will be used (in FEE mode) to multiply the external 4 MHz oscillator up to
40-MHz to achieve 20 MHz bus frequency.
After the MCU is released from reset, the ICG is in self-clocked mode (SCM) and supplies approximately
8 MHz on ICGOUT which corresponds to a 4 MHz bus frequency (f
During reset initialization software, the clock scheme will be set to FLL engaged, external (FEE). So
Solving for N / R gives:
The values needed in each register to set up the desired operation are:
ICGC1 = $78 (%01111000)
Freescale Semiconductor
Bit 7
Bit 6
Bit 5
Bits 4:3 CLKS
Bit 2
Bit 1
Bit 0
RESET, STOP1, OR STOP2
FLL LOCK STATUS.
Example #2: External Crystal = 4 MHz, Bus Frequency = 20 MHz
RECOVERY FROM
INITIALIZE ICG
RANGE
REFS
OSCSTEN 0
ICG1 = $38
ICG2 = $00
CONTINUE
LOCK = 1?
CHECK
N / R = 40 MHz /(4 MHz * 1) = 10 ; We can choose N = 10 and R = 1
YES
0
1
1
11
0
0
f
NO
ICGOUT
Figure 7-8. ICG Initialization for FEE in Example #1
Unimplemented or reserved, always reads zero
Configures oscillator for high-frequency range; FLL prescale factor is 1
Requests an oscillator
FLL engaged, external reference clock mode
Disables the oscillator in stop modes
Reserved for Freescale Semiconductor internal use; always write zero
Unimplemented or reserved, always reads zero
= f
QUICK RECOVERY FROM STOP
ext
MC9S08GB/GT Data Sheet, Rev. 2.3
RECOVERY FROM STOP3
* P * N / R ; P = 1, f
FLL LOCK STATUS.
OSCSTEN = 1
CONTINUE
LOCK = 1?
CHECK
YES
NOTE: THIS WILL REQUIRE THE OSCILLATOR TO START AND
STABILIZE. ACTUAL TIME IS DEPENDENT ON CRYSTAL /RESONATOR
AND EXTERNAL CIRCUITRY.
NO
ext
= 4.00 MHz
MINIMUM CURRENT DRAW IN STOP
RECOVERY FROM STOP3
Bus
FLL LOCK STATUS.
OSCSTEN = 0
).
CONTINUE
LOCK = 1?
CHECK
Initialization/Application Information
YES
NO
Eqn. 7-3
Eqn. 7-4
113
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