参数资料
型号: DSPB56367AG150
厂商: Freescale Semiconductor
文件页数: 66/100页
文件大小: 0K
描述: IC DSP 24BIT 150MHZ 144-LQFP
标准包装: 60
系列: DSP56K/Symphony
类型: 音频处理器
接口: 主机接口,I²C,SAI,SPI
时钟速率: 150MHz
非易失内存: ROM(240 kB)
芯片上RAM: 69kB
电压 - 输入/输出: 3.30V
电压 - 核心: 1.80V
工作温度: -40°C ~ 95°C
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
Serial Host Interface (SHI) I2C Protocol Timing
DSP56367 Technical Data, Rev. 2.1
3-44
Freescale Semiconductor
3.13.1
Programming the Serial Clock
The programmed serial clock cycle, TI2CCP, is specified by the value of the HDM[7:0] and HRS bits of the
HCKR (SHI clock control register).
The expression for TI2CCP is
where
HRS is the prescaler rate select bit. When HRS is cleared, the fixed divide-by-eight prescaler is
operational. When HRS is set, the prescaler is bypassed.
HDM[7:0] are the divider modulus select bits. A divide ratio from 1 to 256
(HDM[7:0] = $00 to $FF) may be selected.
In I2C mode, the user may select a value for the programmed serial clock cycle from
to
The programmed serial clock cycle (TI2CCP), SCL rise time (TR), and the filters selected should be chosen
in order to achieve the desired SCL serial clock cycle (TSCL), as shown in Table 3-18.
EXAMPLE:
For DSP clock frequency of 100 MHz (i.e. TC = 10ns), operating in a standard mode I
2C environment
(FSCL = 100 kHz (i.e. TSCL = 10s), TR = 1000ns), with wide filters enabled:
Choosing HRS = 0 gives
Thus the HDM[7:0] value should be programmed to $36 (=54).
The resulting TI2CCP will be:
Table 3-18 SCL Serial Clock Cycle (TSCL) Generated as Master
Filters bypassed
TI2CCP + 2.5 × TC + 45ns + TR
Narrow filters enabled
TI2CCP + 2.5 × TC + 135ns + TR
Wide filters enabled
TI2CCP + 2.5 × TC + 223ns + TR
T
I
2
CCP
T
C
2
×
H
( DM 7 0
:
[] 1 )
7
(
×
1
(
HRS
) 1 )
+
×
+
×
[]
=
6T
C if HDM 7 0
:
[]
02 and HRS
$
1
==
()
×
4096
T
C if HDM 7 0
:
[]
FF and HRS
$
0
==
()
×
T
I
2
CCP
10
s 2.5 10ns
×
223ns
1000ns
8752ns
=
=
HDM 7 0
:
[]
8752ns
() 2
(
10ns
×
8
) 1 53.7
=
×
=
T
I
2
CCP
T
C
2
×
H
( DM 7 0
:
[] 1 )
71
(
×
0
) 1
+
()
×
+
×
[]
=
T
I
2
CCP
10ns
2
×
54
(
1
)
7
(
×
1
(
0
) 1 )
+
×
+
×
[]
=
T
I
2
CCP
10
[ ns 2
×
54
×
8
] 8640ns
=
×
=
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