MC56F8323EVME Freescale Semiconductor, MC56F8323EVME Datasheet - Page 32

• Manufacturer Part Number: MC56F8323EVME
• Description: BOARD EVALUATION MC56F8323
• Manufacturer: Freescale Semiconductor
• Type: DSPr

Specifications of MC56F8323EVME

• Contents: Module and Misc Hardware
• Processor To Be Evaluated: MC56F8322 and MC56F8323
• Data Bus Width: 16 bit
• Interface Type: RS-232
• Silicon Manufacturer: Freescale
• Core Architecture: 56800/E
• Core Sub-architecture: 56800/E
• Silicon Core Number: MC56F
• Silicon Family Name: MC56F83xx
• Rohs Compliant: Yes
• For Use With/related Products: MC56F8322, MC56F8323
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

to increase or decrease capacitance. Upon power-up, the default value of this trim is 512 units. Each unit
added or deleted changes the output frequency by about 0.1%, allowing incremental adjustment until the
desired frequency accuracy is achieved.
The internal oscillator is calibrated at the factory to 8MHz and the TRIM value is stored in the Flash
information block and loaded to the FMOPT1 register at reset. When using the relaxation oscillator, the
boot code should read the FMOPT1 register and set this value as OSCTL TRIM. For further information,
see the 56F8300 Peripherals User Manual.
3.4 Internal Clock Operation
At reset, both oscillators will be powered up; however, the relaxation oscillator will be the default clock
reference for the PLL. Software should power down the block not being used and program the PLL for the
correct frequency.
32
EXTAL
XTAL
Crystal
OSC
÷ (1, 2, 4, 8)
Prescaler
CLK_MODE
PLLCID
Figure 3-4 Internal Clock Operation
56F8323 Technical Data, Rev. 17
Relaxation
MUX
x (1 to 128)
OSC
Detector
PLLDB
Lock
PLL
F
OUT
PRECS
÷ 2
Reference
F
Detector
OUT
Loss of
Clock
/2
÷ (1, 2, 4, 8)
Postscaler
Bus Interface
PLLCOD
& Control
loss of reference
clock interrupt
LCK
Postscaler CLK
ZSRC
Freescale Semiconductor
SYS_CLK2
source to
the SIM
Interface
Bus
Preliminary