參數(shù)資料
型號: DSPA56371
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: SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs
中文描述: SigmaDSP的28-/56-Bit音頻處理器雙ADC和4個DAC
文件頁數(shù): 65/124頁
文件大?。?/td> 1752K
代理商: DSPA56371
Serial Host Interface (SHI) I2C Protocol Timing
Freescale Semiconductor
DSP56371 Technical Data
45
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
TI2CCP = [TC × 2 × (HDM[7:0] + 1) × (7 × (1 – HRS) + 1)]
where
HRS is the pre-scaler rate select bit. When HRS is cleared, the fixed
divide-by-eight pre-scaler is operational. When HRS is set, the pre-scaler 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
6
× TC
(if HDM[7:0] = $02 and HRS = 1)
to
4096
× TC (if HDM[7:0] = $FF and HRS = 0)
The programmed serial clock cycle (TI2CCP), SCL rise time (TR), should be chosen in order to achieve the desired SCL serial
clock cycle (TSCL), as shown in Table 22.
Figure 13.
I2C Timing
Start
SCL
HREQ
SDA
ACK
MSB
LSB
Stop
44
Stop
46
49
48
50
51
53
52
45
58
55
56
61
47
60
57
59
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