參數(shù)資料
型號: DSP56364P
廠商: 飛思卡爾半導體(中國)有限公司
元件分類: 數(shù)字信號處理
英文描述: 24-Bit Audio Digital Signal Processor
中文描述: 24位音頻數(shù)字信號處理器
文件頁數(shù): 62/148頁
文件大?。?/td> 1204K
代理商: DSP56364P
Serial Host Interface (SHI) I
2
C Protocol Timing
DSP56364 Technical Data, Rev. 4
3-46
Freescale Semiconductor
In I
2
C mode, the user may select a value for the programmed serial clock cycle from
to
The programmed serial clock cycle (T
I
in order to achieve the desired SCL frequency, as shown in
Table 3-19
.
2
CCP
), SCL rise time (T
R
), and the filters selected should be chosen
EXAMPLE:
For DSP clock frequency of 100 MHz (i.e. T
C
= 10ns), operating in a standard-mode I
2
C environment
(F
SCL
= 100 KHz (i.e. T
SCL
= 10
μ
s), T
R
= 1000ns), with filters bypassed
Choosing HRS = 0 gives
Thus the HDM[7:0] value should be programmed to $38 (=56).
Figure 3-22 I
2
C Timing
Table 3-19 SCL Serial Clock Cycle generated as Master
Filters bypassed
T
I
2
CCP
+ 2.5
×
T
C
+ 45ns +
T
R
Narrow filters enabled
T
I
2
CCP
+ 2.5
×
T
C
+ 135ns +
T
R
Wide filters enabled
T
I
2
CCP
+ 2.5
×
T
C
+ 223ns +
T
R
6
T
C
if HDMS
5 0
:
[
]
02
$
and
HRS
1
=
=
(
)
×
4096
T
C
if HDMS
7 0
:
[
]
FF
$
and
HRS
0
=
=
(
)
×
T
I
2
CCP
10
μ
s
2.5
10ns
45ns
1000ns
×
893ns
=
=
HDM 7 0
:
]
8930ns
(
)
2
10ns
×
8
×
(
)
1
55.8
=
=
Start
SCL
HREQ
SDA
ACK
MSB
LSB
Stop
171
Stop
173
176
175
177
178
180
179
172
186
182
183
189
174
188
184
187
AA0275
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