EFM32G-DK3550【PDF 301/467 页】KIT DEVELOPMENT EFM32 GECKO

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...the world's most energy friendly microcontrollers

Bit

10

Name

RTCC0TEN

Reset

0

Access

RW

Description

RTC Compare 0 Trigger Enable

Allows the LETIMER to be started on a compare match on RTC compare channel 0.

Value

0

1

Description

LETIMER is not affected by RTC compare channel 0

A compare match on RTC compare channel 0 starts the LETIMER if the LETIMER is not already started

9

COMP0TOP

0

RW

Compare Value 0 Is Top Value

When set, the counter is cleared in the clock cycle after a compare match with compare channel 0.

Value

0

1

Description

The top value of the LETIMER is 65535 (0xFFFF)

The top value of the LETIMER is given by COMP0

8

BUFTOP

0

RW

Buffered Top

Set to load COMP1 into COMP0 when REP0 reaches 0, allowing a buffered top value

Value

0

1

Description

COMP0 is only written by software

COMP1 is set to COMP1 when REP0 reaches 0

7

OPOL1

0

RW

Output 1 Polarity

Defines the idle value of output 1.

6

OPOL0

0

RW

Output 0 Polarity

Defines the idle value of output 0.

5:4

UFOA1

0x0

RW

Underflow Output Action 1

Defines the action on LETn_O1 on a LETIMER underflow.

Value

0

1

2

3

Mode

NONE

TOGGLE

PULSE

PWM

Description

LETn_O1 is held at its idle value as defined by OPOL1.

LETn_O1 is toggled on CNT underflow.

LETn_O1 is held active for one LFACLK LETIMER0 clock cycle on CNT underflow. The

output then returns to its idle value as defined by OPOL1.

LETn_O1 is set idle on CNT underflow, and active on compare match with COMP1

3:2

UFOA0

0x0

RW

Underflow Output Action 0

Defines the action on LETn_O0 on a LETIMER underflow.

Value

0

1

2

3

Mode

NONE

TOGGLE

PULSE

PWM

Description

LETn_O0 is held at its idle value as defined by OPOL0.

LETn_O0 is toggled on CNT underflow.

LETn_O0 is held active for one LFACLK LETIMER0 clock cycle on CNT underflow. The

output then returns to its idle value as defined by OPOL0.

LETn_O0 is set idle on CNT underflow, and active on compare match with COMP1

1:0

REPMODE

0x0

RW

Repeat Mode

Allows the repeat counter to be enabled and disabled.

Value

0

1

2

3

Mode

FREE

ONESHOT

BUFFERED

DOUBLE

Description

When started, the LETIMER counts down until it is stopped by software.

The counter counts REP0 times. When REP0 reaches zero, the counter stops.

The counter counts REP0 times. If REP1 has been written, it is loaded into REP0 when

REP0 reaches zero. Else the counter stops

Both REP0 and REP1 are decremented when the LETIMER wraps around. The

LETIMER counts until both REP0 and REP1 are zero

21.5.2 LETIMERn_CMD - Command Register (Async Reg)

For more information about Asynchronous Registers please see Section 5.3 (p. 18) .

2011-04-12 - d0001_Rev1.10

301

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