CC1010-RTY1 datasheet(60/152 Pages) TI

60 / 152 page

CC1010

SWRS047

Page 60 of 152

Figure 11. Timer Mode operation for Timer 2 / Timer 3

T2PRE (0xAA) - Timer 2 Prescaler Control

Bit

Name

R/W

Reset value

Description

7:0

T2PRE(7:0) R/W 0x00

Timer 2 Prescaler Control.

In Timer Mode,

T2PRE sets the 8 most significant bits of

the 16-bit counter reload value. In PWM Mode,

T2PRE

sets the prescaler value that sets the PWM period.

T3PRE (0xAB) - Timer 3 Prescaler Control

Bit

Name

R/W

Reset value

Description

7:0

T3PRE(7:0) R/W 0x00

Timer 3 Prescaler Control.

In Timer Mode,

T3PRE sets the 8 most significant bits of

the 16-bit counter reload value. In PWM Mode,

T3PRE

sets the prescaler value that sets the PWM period.

T2 (0xAC) - Timer 2 Low byte counter value

Bit

Name

R/W

Reset value

Description

7:0

T2(7:0)

R/W

0x00

In Timer Mode,

T2 sets the 8 least significant bits of the

16-bit counter reload value. In PWM Mode

T2 sets the

PWM duty cycle.

T3 (0xAD) - Timer 3 Low byte counter value

Bit

Name

R/W

Reset value

Description

7:0

T3(7:0)

R/W

0x00

In Timer Mode,

T3 sets the 8 least significant bits of the

16-bit counter reload value. In PWM Mode

T3 sets the

PWM duty cycle.

16.3.2

PWM Mode

Timer 2 /Timer 3 can be set in PWM Mode

by setting the bit TCON2.M2 / TCON2.M3.

The pins P3.4 / P3.5 are then enabled as

outputs, overriding the port direction bit

P3DIR.4 / P3DIR.5. The port direction is

overridden independent of the timer run

control bit TCON2.TR2 / TCON2.TR3.

Interrupts are not generated in PWM

mode.

P3.4 is the PWM output for timer 2, P3.5

is the PWM output for Timer 3.

The PWM operation is illustrated in Figure

13. The PWM period TnPWM for timer n is

set by TnPRE:

(

)

system

nPWM

255

⋅

TnPRE

Divide

by 255

Timer 2 (or Timer 3)

16 bit counter

EXIF.TF2

(or EXIF.TF3)

Timer 2

(or Timer 3)

interrupt request

Clk

Mux

9 10 11 12 13 14 15

0 12

T2 (or T3)

T2PRE (or T3PRE)

Underflow

TR2

(or TR3)

System

Clock

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