ST10F296 datasheet(116/346 Pages) STMICROELECTRONICS

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ST10F296E

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XPWMPORT register

The XPWMPORT register is enabled and visible only when the XPEN and XPWMEN bits of

the SYSCON and XPERCON registers respectively are set.

12.2.1

Software control of the XPWM outputs

In an application, the XPWM output signals are generally controlled by the XPWM module.

However, it may be necessary to influence the level of the XPWM output pins via software,

either to initialize the system or to react to some extraordinary conditions such as a system

fault or an emergency.

Clearing the timer run bit PTRx stops the associated counter and leaves the respective

output at its current level.

The individual XPWM channel outputs are controlled by comparators according to the

formula:

PWM output signal = [XPTx] > [XPWx shadow latch]

Whenever software changes register XPTx, the respective output reflects the condition after

the change. Loading timer XPTx with a value greater than or equal to the value in XPWx

immediately sets the respective output, an XPTx value below the XPWx value clears the

respective output.

By clearing or setting the respective XPWMPORT output latch the XPWM channel signal is

driven directly or inverted to the port pin.

Clearing the enable bit PENx disconnects the XPWM channel and switches the respective

pin to the value in the port output latch XP.y.

Note:

To prevent further PWM pulses from occurring after such a software intervention the

respective counter must be stopped first.

Figure 27 shows the XPWM output signal generation.

XPWMPORT (EC80h)

XBus

Reset value: 0000h

Reserved

XODP

XDP

XODP

XDP

XODP8

XDP

XODP

XDP

-RW

RW RW

Table 60.

XPWMPORT register description

Bit

Bit name

Function

15-12

Reserved

11, 8, 5, 2

XODP.y

Port open-drain control register bit y

0: Port line XPOUT.y output driver in push-pull mode

1: Port line XPOUT.y output driver in open-drain mode

10, 7, 4, 1

XP.y

Port data register bit y

9, 6, 3, 0

XDP.y

Port direction register bit y

0: Port line XPOUT.y is an input (high impedance)

1: Port line XPOUT.y is an output

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