ST10F280 datasheet(61/186 Pages) STMICROELECTRONICS

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ST10F280

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11.2 - New PWM Module : XPWM

The new Pulse Width Modulation (XPWM) Module

of the ST10F280 is mapped on the XBUS inter-

face (Address range 00’EC00h-00’ECFFh) and

allows the generation of up to 4 independent

PWM signals.The XPWM is enabled by setting

XPEN bit 2 of the SYSCON register and bit 4 of

the new XPERCON register. The frequency range

of these XPWM signals for a 40MHz CPU clock is

from 9.6Hz up to 20MHz for edge aligned signals.

For center aligned signals the frequency range is

4.8Hz up to 10MHz (see detailed description).

The minimum values depend on the width (16 bit)

and the resolution (CLK/1 or CLK/64) of the

XPWM timers. The maximum values assume that

the XPWM output signal changes with every cycle

of the respective timer. In a real application the

maximum XPWM frequency will depend on the

required resolution of the XPWM output signal

(see Figure 18).

The Pulse Width Modulation Module consists of

4 independent PWM channels. Each channel has

a 16-bit up/down counter XPTx, a 16-bit period

width register XPWx with a shadow latch, two

comparators, and the necessary control logic. The

operation of all four channels is controlled by two

common control registers, XPWMCON0 and

XPWMCON1, and the interrupt control and status

is handled by one interrupt control register

XP2IC, which is also common for all channels

(see Figure 19).

Figure 19 : XPWM Channel Block Diagram

Figure 18 : SFRs and Port Pins Associated with the XPWM Module

Data Registers

XPP0

YYY Y Y Y YYYYYYYYYY

XPW0

YYY Y Y Y YYYYYYYYYY

XPP1

YYY Y Y Y YYYYYYYYYY

XPW1

YYY Y Y Y YYYYYYYYYY

XPP2

YYY Y Y Y YYYYYYYYYY

XPW2

YYY Y Y Y YYYYYYYYYY

XPP3

YYY Y Y Y YYYYYYYYYY

XPW3

XPT0

YY YY Y Y YYYYYYYYYY

XPT1

YY YY Y Y YYYYYYYYYY

XPT2

YY YY Y Y YYYYYYYYYY

XPT3

Counter Registers

XPWMCON0

YY -

Y -

- - YYYYY YYY

XPWMCON1

---

------ Y Y Y Y

XPOLAR

---

- - YYYYY YYY

XP2IC E

Control Registers and Interrupt Control

Output on dedicated pins

XPWM0

XPWM1

XPWM2

XPWM3

XPPx

XPWx

XPTx

XPWMCONx

XPOLARx

XPWM Period Register x

XPWM Pulse WIdth Register x

XPWM Counter Register x

XPWM Control Register 0/1

XPWM Output Polarity Control Register 0/1

XP2IC

XPWM Interrupt Control Register

This bit has a XPWM function

This bit has no XPWH function or is not implemnented

This register belongs to ESFR area

XPPx Period Register

Comparator

XPTx

16-bit Up/Down Counter

Shadow Register

XPWx 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

XPOUTx

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