參數(shù)資料
型號: MCIMX281AVM4B
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 454 MHz, RISC PROCESSOR, PBGA289
封裝: 14 X 14 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-289
文件頁數(shù): 43/72頁
文件大?。?/td> 915K
代理商: MCIMX281AVM4B
i.MX28 Applications Processors Data Sheet for Automotive Products, Rev. 1
48
Freescale Semiconductor
3.5.11
Pulse Width Modulator (PWM) Timing
Figure 30 depicts the timing of the PWM, and Table 52 lists the PWM timing characteristics.
The PWM can be programmed to select one of two clock signals as its source frequency: xtal clock or
hsadc clock. The selected clock signal is passed through a prescaler before being input to the counter. The
output is available at the pulse width modulator output (PWMO) external pin.
PWM also supports MATT mode. In this mode, it can be programmed to select one of two clock signals
as its source frequency, 24-MHz or 32-KHz crystal clock. For a 32-KHz source clock input, the PWM
outputs the 32-KHz clock directly to PAD.
Figure 30. PWM Timing
SJ10
TCK low to TDO data valid
44
ns
SJ11
TCK low to TDO high impedance
44
ns
SJ12
TRST assert time
100
ns
SJ13
TRST set-up time to TCK low
40
ns
1 V
M – mid point voltage
Table 52. PWM Output Timing Parameter: Xtal clock
Ref No.
Parameter
Minimum
Maximum
Unit
1
System CLK frequency1
1 CL of PWMO = 30 pF
0
24MHz
MHz
2a
Clock high time
21
ns
2b
Clock low time
21
ns
3a
Clock fall time
0.3
ns
3b
Clock rise time
0.3
ns
4a
Output delay time
15.08
ns
4b
Output setup time
15.77
ns
Table 51. SJC Timing Parameters (continued)
ID
Parameter
All Frequencies
Unit
Min.
Max.
4a
PWM Source Clock
2a
1
PWM Output
2b
3a
3b
4b
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