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MC68HC908GR16A Datasheet(PDF) 62 Page - Freescale Semiconductor, Inc

No. de Pieza. MC68HC908GR16A
Descripción  M68HC08 Microcontrollers
Descarga  270 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC68HC908GR16A Datasheet(HTML) 62 Page - Freescale Semiconductor, Inc

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Clock Generator Module (CGM)
MC68HC908GR16A Data Sheet, Rev. 1.0
62
Freescale Semiconductor
4.
Select a VCO frequency multiplier, N.
5.
Calculate and verify the adequacy of the VCO and bus frequencies fVCLK and fBUS.
6.
Select the VCO’s power-of-two range multiplier E, according to Table 4-2.
7.
Select a VCO linear range multiplier, L, where fNOM = 71.4 kHz
8.
Calculate and verify the adequacy of the VCO programmed center-of-range frequency, fVRS. The
center-of-range frequency is the midpoint between the minimum and maximum frequencies
attainable by the PLL.
fVRS = (L x 2
E) f
NOM
9.
For proper operation,
10.
Verify the choice of N, E, and L by comparing fVCLK to fVRS and fVCLKDES. For proper operation,
fVCLK must be within the application’s tolerance of fVCLKDES, and fVRS must be as close as possible
to fVCLK.
NOTE
Exceeding the recommended maximum bus frequency or VCO frequency
can crash the MCU.
11.
Program the PLL registers accordingly:
a.
In the VPR bits of the PLL control register (PCTL), program the binary equivalent of E.
b.
In the PLL multiplier select register low (PMSL) and the PLL multiplier select register high
(PMSH), program the binary equivalent of N. If using a 1–8 MHz reference, the PMSL register
must be reprogrammed from the reset value before enabling the PLL.
c.
In the PLL VCO range select register (PMRS), program the binary coded equivalent of L.
Table 4-2. Power-of-Two Range Selectors
Frequency Range
E
0 < fVCLK ≤ 8 MHz
0
8 MHz< fVCLK ≤ 16 MHz
1
16 MHz< fVCLK ≤ 32 MHz
2(1)
1. Do not program E to a value of 3.
N
round
f
VCLKDES
f
RCLK
--------------------------
⎝⎠
⎜⎟
⎛⎞
=
f
VCLK
N
() f
RCLK
×
=
f
BUS
f
VCLK
() 4
=
L = Round
fVCLK
2E x fNOM
f
VRS
f
VCLK
f
NOM
2
E
×
2
---------------------------


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