MC908AP32CFBE Freescale, MC908AP32CFBE Datasheet - Page 85
MC908AP32CFBE
Manufacturer Part Number
MC908AP32CFBE
Description
Manufacturer
Freescale
Datasheet
1.MC908AP32CFBE.pdf
(324 pages)
Specifications of MC908AP32CFBE
Cpu Family
HC08
Device Core Size
8b
Frequency (max)
8MHz
Interface Type
SCI/SPI
Total Internal Ram Size
2KB
# I/os (max)
32
Number Of Timers - General Purpose
4
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PQFP
Program Memory Type
Flash
Program Memory Size
32KB
Lead Free Status / RoHS Status
Compliant
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Table 6-1
Freescale Semiconductor
5. Select the VCO’s power-of-two range multiplier E, according to this table:
6. Select a VCO linear range multiplier, L, where f
7. Calculate and verify the adequacy of the VCO programmed center-of-range frequency, f
8. Verify the choice of P, R, N, E, and L by comparing f
9. Program the PLL registers accordingly:
center-of-range frequency is the midpoint between the minimum and maximum frequencies
attainable by the PLL.
For proper operation,
operation, f
as possible to f
a. In the PRE bits of the PLL control register (PCTL), program the binary equivalent of P.
b. In the VPR bits of the PLL control register (PCTL), program the binary equivalent of E.
d. In the PLL VCO range select register (PMRS), program the binary coded equivalent of L.
e. In the PLL reference divider select register (PMDS), program the binary coded equivalent of
c. In the PLL multiplier select register low (PMSL) and the PLL multiplier select register high
provides numeric examples (numbers are in hexadecimal notation):
(PMSH), program the binary equivalent of N.
R.
Exceeding the recommended maximum bus frequency or VCO frequency
can crash the MCU.
The values for P, E, N, L, and R can only be programmed when the PLL is
off (PLLON = 0).
VCLK
VCLK.
must be within the application’s tolerance of f
NOTE: Do not program E to a value of 3.
19,660,800 ≤ f
9,830,400 ≤ f
MC68HC908AP Family Data Sheet, Rev. 4
0 < f
Frequency Range
VCLK
f
VRS
L
f
VCLK
VRS
VCLK
=
< 9,830,400
–
round
f
< 19,660,800
< 39,321,600
VCLK
=
NOTE
NOTE
(
L 2
⎛
⎜
⎝
×
--------------------------
2
≤
E
NOM
f
f
--------------------------
E
VCLK
×
NOM
)f
f
NOM
NOM
2
= 125kHz
VCLK
×
⎞
⎟
⎠
2
E
to f
VRS
VCLKDES
and f
E
0
1
2
, and f
VCLKDES
VRS
Functional Description
. For proper
must be as close
VRS
. The
85
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