ST10F272M datasheet(62/175 Pages) STMICROELECTRONICS

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PWM modules

ST10F272M

62/176

PWM modules

Two pulse width modulation modules are available on ST10F272M: standard PWM0 and

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

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

single shot outputs. Table 36 shows 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 36.

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

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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