PIC16C774T-I/SO 查看數據表（PDF） - Microchip Technology

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PIC16C774T-I/SO

28/40-Pin, 8-Bit CMOS Microcontrollers w/ 12-Bit A/D

Microchip Technology 

PIC16C77X

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.

FIGURE 6-2: TIMER2 BLOCK DIAGRAM

Sets flag

bit TMR2IF

TMR2

output

(1)

Reset

TMR2 reg

Postscaler

Comparator

1:1 to 1:16 EQ

4

PR2 reg

Prescaler

1:1, 1:4, 1:16 FOSC/4

2

Note 1: TMR2 register output can be software selected

by the SSP Module as a baud 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

10Bh,18Bh

PEIE

T0IE

INTE

RBIE

T0IF

INTF

RBIF 0000 000x 0000 000u

0Ch

PIR1

PSPIF(1)

ADIF

RCIF

TXIF

SSPIF CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000

8Ch

PIE1

PSPIE(1)

ADIE

RCIE

TXIE

SSPIE CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000

11h

TMR2 Timer2 module’s register

0000 0000 0000 0000

12h

T2CON

—

TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000

92h

PR2

Timer2 Period Register

1111 1111 1111 1111

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

Note 1: These bits are reserved on the 28-pin, always maintain these bits clear.

DS30275B-page 46

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