ST10F296 datasheet(114/346 Pages) STMICROELECTRONICS

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Pulse-width modulation (PWM) modules

ST10F296E

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Pulse-width modulation (PWM) modules

Two PWM modules are available on ST10F296E: 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. Table 57 and Table 58 show the PWM frequencies for different resolutions. The

level of the output signals is selectable and the PWM modules can generate interrupt

requests.

Figure 26 shows the block diagram of the PWM module.

Figure 26.

Block diagram of PWM module

User readable/writeable register

PPx period register(1)

Comparator

PTx

16-bit Up/down counter(1)

Shadow register

PWx pulse width register(1)

Input

Run

control

Clock 1

Clock 2

Comparator

Up/down/

clear control

Match

Output control

Match

Write control

Enable

POUTx

Table 57.

PWM unit frequencies and resolution at 40 MHz CPU clock

Mode 0

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU clock/1

25 ns

156.25 kHz

39.1 kHz

9.77 kHz

2.44 Hz

610 Hz

CPU clock/64

1.6 µs

2.44kHz

610 Hz

152.6 Hz

38.15Hz

9.54 Hz

Mode 1

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU clock/1

25 ns

78.12 kHz

19.53 kHz

4.88 kHz

1.22 kHz

305.2 Hz

CPU clock/64

1.6 µs

1.22 kHz

305.17 Hz

76.29 Hz

19.07 Hz

4.77 Hz

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