ST10F280_12 datasheet(88/239 Pages) STMICROELECTRONICS

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PWM module

ST10F280

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Doc ID 8673 Rev. 3

PWM cycle, or upon a write access to XPPx, while the timer is stopped. The CPU accesses

the XPPx register while the hardware compares the contents of the shadow register with the

contents of the associated counter XPTx. When a match is found between counter and

XPPx shadow register, the counter is either reset to 0000h, or the count direction is switched

from counting up to counting down, depending on the selected operating mode of that

XPWM channel. For the register locations refer to the Table 15.

Pulse width registers XPWx

This 16-bit register holds the actual PWM pulse width value which corresponds to the duty

cycle of the PWM signal. This register is buffered with a shadow register. The CPU

accesses the XPWx register while the hardware compares the contents of the shadow

from the respective XPWx register at the beginning of every new PWM cycle, or upon a

write access to XPWx, while the timer is stopped.When the counter value is greater than or

equal to the shadow register value, the PWM signal is set, otherwise it is reset. The output

of the comparators may be described by the boolean formula:

PWM output signal = [XPTx]

≥ [XPWx shadow latch].

This type of comparison allows a flexible control of the PWM signal. For the register

locations refer to the Table 15.

Table 15.

XPWM module channel specific register addresses

Address

XPW0

EC30h

XPT0

EC10h

XPW1

EC32h

XPT1

EC12h

XPW2

EC34h

XPT2

EC14h

XPW3

EC36h

XPT3

EC16h

These registers are not bit-addressable.

XPP0

EC20h

XPP1

EC22h

XPP2

EC24h

XPP3

EC26h

Table 16.

XPWM frequency

Mode 0

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU Clock/1

25ns

156.25kHz

39.06kHz

9.77kHz

2.44Hz

610.35Hz

CPU Clock/64

1.6

μs

2.44Hz

610.35Hz

152.58Hz

38.15Hz

9.54Hz

Mode 1

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU Clock/1

25ns

78.12kHz

19.53kHz

4.88kHz

1.22kHz

305.17Hz

CPU Clock/64

1.6

μs

1.22kHz

305.17Hz

76.29Hz

19.07Hz

4.77Hz

ST10F280 Datasheet(PDF) 88 Page - STMicroelectronics

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