ST10F271 datasheet(62/173 Pages) STMICROELECTRONICS

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PWM modules

ST10F271

62/173

PWM modules

Two pulse width modulation modules are available on ST10F271: standard PWM0 and

XBus PWM1. They can generate up to four PWM output signals each, using edge-aligned or

centre-aligned PWM. In addition, the PWM modules can generate PWM burst signals and

single shot outputs. The Table 38 and Table 39 show the PWM frequencies for different

resolutions. The level of the output signals is selectable and the PWM modules can

generate interrupt requests.

Figure 12.

Block diagram of PWM module

Table 38.

PWM unit frequencies and resolutions at 40 MHz CPU clock

Mode 0

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU Clock/1

25ns

156.25 kHz

39.1 kHz

9.77 kHz

2.44Hz

610Hz

CPU

Clock/64

1.6

µs

2.44 kHz

610Hz

152.6Hz

38.15Hz

9.54Hz

Mode 1

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU Clock/1

25ns

78.12 kHz

19.53 kHz

4.88 kHz

1.22 kHz

305.2Hz

CPU

Clock/64

1.6

µs

1.22 kHz

305.17Hz

76.29Hz

19.07Hz

4.77Hz

Table 39.

PWM unit frequencies and resolutions at 64 MHz CPU clock

Mode 0

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU Clock/1

15.6ns

250 kHz

62.5 kHz

15.63 kHz

3.91Hz

977Hz

CPU

Clock/64

1.0

µs

3.91 kHz

976.6Hz

244.1Hz

61.01Hz

15.26Hz

Mode 1

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU Clock/1

15.6ns

125 kHz

31.25 kHz

7.81 kHz

1.95 kHz

488.3Hz

CPU

Clock/64

1.0

µs

1.95 kHz

488.28Hz

122.07Hz

30.52Hz

7.63Hz

PPx Period Register

Comparator

PTx

16-bit Up/Down Counter

Shadow Register

PWx Pulse Width Register

Input

Run

Control

Clock 1

Clock 2

Comparator

Up/Down/

Clear Control

Match

Output Control

Match

Write Control

* User readable / writeable register

Enable

POUTx

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