RM0352 datasheet(61/138 Pages) STMICROELECTRONICS

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RM0352

ARM© dual timer module (SP804)

137

Control register, TimerXControl

The bit assignments of the control register are listed in

Table 53.

Caution:

The counter mode, size or prescale settings must not be changed while the Timer module is

running. If a new configuration is required then the Timer module must be disabled and then

the new configuration values written to the appropriate registers. The Timer module must

then be re-enabled after the configuration changes are complete. Failure to follow this

procedure can result in unpredictable behavior of the device.

Interrupt clear register. TimerXIntClr

Any write to this register, clears the interrupt output from the counter.

Table 53. Control register bit assignments

Bits

Name

Type

Function

[31:8]

RESERVED bits, do not modify, and ignore on read

[7]

TimerEn

Read/write

Enable bit:

0 = timer module disabled (default)

1 = timer module enabled.

[6]

TimerMode

Read/write

Mode bit:

0 = timer module is in free running mode (default)

1 = Timer module is in periodic mode.

[5]

IntEnable

Read/write

Interrupt Enable bit:

0 = timer module Interrupt disabled

1 = timer module Interrupt enabled (default).

[4]

RESERVED bit, do not modify, and ignore on read

[3:2]

TimerPre

Read/write

Prescale bits:

00 = 0 stages of prescale, clock is divided by 1 (default)

01 = 4 stages of prescale, clock is divided by 16

10 = 8 stages of prescale, clock is divided by 256

11 = Undefined, do not use.

[1]

TimerSize

Read/write

Selects 16/32 bit counter operation:

0 = 16-bit counter (default)

1 = 32-bit counter.

[0]

OneShot

Read/write

Selects one-shot or wrapping counter mode:

0 = wrapping mode (default)

1 = one-shot mode.

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