RT3052F datasheet(39/235 Pages) ETC1

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RT3050/52

Datasheet

Preliminary

Revision August 14, 2008

DSR3050/52_V.2.0_081408

-39-

Form No.：QS-073-F02

Rev.：1

Kept by： DCC

Ret. T ime： 5 Years

TMR0 LOAD r egister in all other modes.

Writing a ‘0’ to this bit has no effect. Reading this bit will

return a ‘0’.

3:2

Reserved

2’b0

R/C

TMR1INT

Timer 1 Interrupt Status

This bit is set if Timer 1 has expired. The Timer 1 interrupt

to the processor is set when this bit is ‘1’. Writing a ‘1’ to

this bit will clear the interrupt. Writing a ‘0’ has no effect.

1’b0

R/C

TMR0INT

Timer 0 Interrupt Status

This bit is set if Timer 0 has expired. The Timer 0 interrupt

to the processor is set when this bit is ‘1’. Writing a ‘1’ to

this bit will clear the interrupt. Writing a ‘0’ has no effect.

1’b0

TMR0 LOAD: Timer 0 Load Value (offset: 0x10)

Bits

Type

Name

Description

Initial value

31:16

R-

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

TMR0VAL: Timer 0 Counter Value (offset: 0x14)

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

TMR0CTL: Timer 0 Control (offset: 0x18)

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

15’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: Time-out

1’b0

3:0

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.

4’b0

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