PIC16LC62B datasheet(32/120 Pages) MICROCHIP

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PIC16C62B/72A

DS35008B-page 32

Preliminary

6.1

Timer2 Operation

The Timer2 output is also used by the CCP module to

generate the PWM "On-Time", and the PWM period

with a match with PR2.

The TMR2 register is readable and writable, and is

cleared on any device reset.

The input clock (FOSC/4) has a prescale option of 1:1,

1:4

1:16,

selected

control

bits

T2CKPS1:T2CKPS0 (T2CON<1:0>).

The match output of TMR2 goes through a 4-bit

postscaler (which gives a 1:1 to 1:16 scaling) to gener-

ate a TMR2 interrupt (latched in flag bit TMR2IF,

(PIR1<1>)).

The prescaler and postscaler counters are cleared

when any of the following occurs:

• a write to the TMR2 register

• a write to the T2CON register

• any device reset (Power-on Reset, MCLR reset,

Watchdog Timer reset or Brown-out Reset)

TMR2 is not cleared when T2CON is written.

6.2

Timer2 Interrupt

The Timer2 module has an 8-bit period register PR2.

Timer2 increments from 00h until it matches PR2 and

then resets to 00h on the next increment cycle. PR2 is

a readable and writable register. The PR2 register is ini-

tialized to FFh upon reset.

6.3

Output of TMR2

The output of TMR2 (before the postscaler) is fed to the

Synchronous Serial Port module, which optionally uses

it to generate shift clock.

TABLE 6-1

REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR,

BOR

Value on

all other

resets

0Bh,8Bh

INTCON

GIE

PEIE

T0IE

INTE

RBIE

T0IF

INTF

RBIF

0000 000x

0000 000u

0Ch

PIR1

—

ADIF

—

SSPIF

CCP1IF

TMR2IF

TMR1IF

-00- 0000

0000 0000

8Ch

PIE1

—

ADIE

—

SSPIE

CCP1IE

TMR2IE

TMR1IE

-0-- 0000

0000 0000

11h

TMR2

Timer2 module’s register

0000 0000

12h

T2CON

—

TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0

TMR2ON

T2CKPS1

T2CKPS0

-000 0000

92h

PR2

Timer2 Period Register

1111 1111

Legend:

= unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by the Timer2 module.

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