MC908GR48AMFAE Freescale Semiconductor, MC908GR48AMFAE Datasheet - Page 75
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MC908GR48AMFAE
Manufacturer Part Number
MC908GR48AMFAE
Description
IC MCU 8BIT 48K FLASH 48-LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908GR32ACFJE.pdf
(314 pages)
Specifications of MC908GR48AMFAE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
37
Program Memory Size
48KB (48K x 8)
Program Memory Type
FLASH
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 24x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC908GR48AMFAE
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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The following conditions apply when in manual mode:
4.3.6 Programming the PLL
Use the following procedure to program the PLL. For reference, the variables used and their meaning are
shown in
Freescale Semiconductor
1. Choose the desired bus frequency, f
2. Calculate the desired VCO frequency (four times the desired bus frequency).
3. Choose a practical PLL (crystal) reference frequency, f
•
•
•
•
•
ACQ is a writable control bit that controls the mode of the filter. Before turning on the PLL in manual
mode, the ACQ bit must be clear.
Before entering tracking mode (ACQ = 1), software must wait a given time, t
Acquisition/Lock Time
control register (PCTL).
Software must wait a given time, t
clock source to CGMOUT (BCS = 1).
The LOCK bit is disabled.
CPU interrupts from the CGM are disabled.
MHz.
Frequency errors to the PLL are corrected at a rate of f
For stability and lock time reduction, this rate must be as fast as possible. The VCO frequency must
be an integer multiple of this rate. The relationship between the VCO frequency, f
reference frequency, f
N, the range multiplier, must be an integer.
Table
The round function in the following equations means that the real number
should be rounded to the nearest integer number.
4-1.
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
f
Variable
f
VCLKDES
BUSDES
f
f
f
RCLK
f
f
VCLK
NOM
BUS
VRS
RCLK
Specifications.), after turning on the PLL by setting PLLON in the PLL
, is:
Table 4-1. Variable Definitions
Desired bus clock frequency
Desired VCO clock frequency
Chosen reference crystal frequency
Calculated VCO clock frequency
Calculated bus clock frequency
Nominal VCO center frequency
Programmed VCO center frequency
AL
f
VCLKDES
, after entering tracking mode before selecting the PLL as the
f
BUSDES
VCLK
= (N) (f
NOTE
= 4 x f
.
Definition
RCLK
BUSDES
)
RCLK
RCLK
. Typically, the reference crystal is 1–8
.
ACQ
Functional Description
(See
VCLK
4.8
, and the
75
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