MC9328MX21_09 Datasheet, PDF (45/100 Pages) Freescale Semiconductor, Inc – i.MX family of microprocessors

Specifications
3.14 Pulse-Width Modulator
The PWM can be programmed to select one of two clock signals as its source frequency. The selected
clock signal is passed through a divider and a prescaler before being input to the counter. The output is
available at the pulse-width modulator output (PWMO) external pin.
2a
System Clock
1
3b
2b
4a
3a
4b
PWM Output
Figure 37. PWM Output Timing Diagram
Table 30. PWM Output Timing Parameters
Ref No.
Parameter
1 System CLK frequency¹
2a Clock high time¹
2b Clock low time¹
3a Clock fall time¹
3b Clock rise time¹
4a Output delay time¹
4b Output setup time¹
1. C_L of PWMO = TBD
1.8 V ± 0.1 V
Minimum
0
12.29
9.91
–
–
9.37
8.71
Maximum
45
–
–
0.5
0.5
–
–
3.0 V ± 0.3 V
Minimum
0
12.29
9.91
–
–
3.61
3.03
Maximum
45
–
–
0.5
0.5
–
–
Unit
MHz
ns
ns
ns
ns
ns
ns
MC9328MX21 Technical Data, Rev. 3.3
Freescale Semiconductor
45