MC56F8347 Freescale Semiconductor, Inc, MC56F8347 Datasheet - Page 138
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MC56F8347
Manufacturer Part Number
MC56F8347
Description
56f8300 16-bit Digital Signal Controllers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC56F8347.pdf
(172 pages)
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10.7 Crystal Oscillator Timing
10.8 External Memory Interface Timing
The External Memory Interface is designed to access static memory and peripheral devices.
shows sample timing and parameters that are detailed in
The timing of each parameter consists of both a fixed delay portion and a clock related portion, as well as
user controlled wait states. The equation:
When using the XTAL clock input directly as the chip clock without prescaling (ZSRC selects prescaler
clock and prescaler set to
clock input. In this situation only, parameter values must be adjusted for the duty cycle at XTAL.
DCAOE and DCAEO are used to make this duty cycle adjustment where needed.
138
should be used to determine the actual time of each parameter. The terms in this equation are defined as:
Crystal Start-up time
Resonator Start-up time
Crystal ESR
Crystal Peak-to-Peak Jitter
Crystal Min-Max Period Variation
Resonator Peak-to-Peak Jitter
Resonator Min-Max Period Variation
Bias Current, high-drive mode
Bias Current, low-drive mode
Quiescent Current, power-down mode
t
D
P
M = Fixed portion of a clock period inherent in the design; this number is adjusted to account
W = Sum of the applicable wait state controls. The “Wait State Controls” column of
= Parameter delay time
= Fixed portion of the delay, due to on-chip path delays
= Period of the system clock, which determines the execution rate of the part
t = D + P * (M + W)
(i.e., when the device is operating at 60MHz, P = 16.67 ns)
for possible derating of clock duty cycle
Table 10-16
56F8300 Peripheral User Manual details what each wait state field controls.
Characteristic
÷ 1),
shows the applicable controls for each parameter and the EMI chapter of the
Table 10-15 Crystal Oscillator Parameters
the EMI quadrature clock is generated using both edges of the EXTAL
56F8347 Technical Data, Rev.11
Symbol
I
I
R
BIASH
BIASL
T
T
T
T
T
I
T
ESR
PD
CS
RS
PV
RP
RJ
D
Table
0.12
Min
0.1
70
—
—
—
—
—
—
4
10-16.
0.18
Typ
250
80
—
—
—
—
—
5
0
Max
120
250
300
300
290
110
1.5
10
1
1
Freescale Semiconductor
ohms
Unit
Figure 10-4
ms
ms
μA
μA
μA
ps
ns
ps
ps
Preliminary