RT3052F datasheet(40/235 Pages) ETC1

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RT3050/52

Datasheet

Preliminary

Revision August 14, 2008

DSR3050/52_V.2.0_081408

-40-

Form No.：QS-073-F02

Rev.：1

Kept by： DCC

Ret. T ime： 5 Years

Value

Timer Clock Frequency

System clock

System clock / 4

System clock / 8

System clock / 16

System clock / 32768

System clock /65536

Note: The pre-scale value should not be changed unless the

timer is disabled.

TMR1 LOAD: Timer 1 Load Value (offset: 0x20)

Bits

Type

Name

Description

Initial value

31:16

Reserved

16’b0

15:0

R/W

TMRLOAD[15:0]

Timer Load Value

This register contains the load value for the timer. In all

modes, this value is loaded into the timer counter when

this register is written. In all modes except free-running

mode, this value is reloaded into the timer counter after

the timer counter reaches 0. It may be updated at any time;

the new value will be written to the counter immediately.

Writing a load value of 0 will disable the timer, except in

free-running mode.

16’b0

TMR1VAL: Timer 1 Counter Value (offset: 0x24)

Bits

Type

Name

Description

Initial value

31:16

Reserved

16’b0

15:0

TMRVAL[15:0]

Timer Counter Value

This register contains the current value of the timer. During

functional operation, writes have no effect.

16’hffff

TMR1CTL: Timer 1 Control (offset: 0x28)

Bits

Type

Name

Description

Initial value

31:16

Reserved

16’b0

R/W

TESTEN

Reserved for Test

This bit should be written with a zero

1’b0

14:8

Reserved

7’b0

R/W

ENABLE

Timer Enable

0: Disable the timer. The timer will stop counting and will

retain its current value.

1: Enable the timer. The timer will begin counting from its

current value.

1’b0

Reserved

1’b0

5:4

R/W

MODE[1:0]

Timer Mode

0: Free-running

1: Periodic

2: Time-out

3: Watchdog

1’b0

2:0

R/W

PRESCALE[3:0]

Timer Clock Pre-scale

These bits are used to scale the timer clock in order to

achieve higher resolution or longer timer periods. Their

definitions are below.

3’b0

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