PIC16C770 Datasheet

IC型号：
PIC16C770
PDF描述：
18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-bit A/D
文件大小：
3585.57KB
PDF页数：
220页
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PIC16C717/770/771

7.2

Timer2 Interrupt

FIGURE 7-1:

Sets flag

bit TMR2IF

TIMER2 BLOCK DIAGRAM

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.

TMR2

output

(1)

Reset

Prescaler

1:1, 1:4, 1:16

TMR2 reg

Comparator

OSC

7.3

Output of TMR2

Postscaler

1:1 to 1:16

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

Synchronous Serial Port module which optionally uses

it to generate shift clock.

PR2 reg

Note 1:

TMR2 register output can be software selected

by the SSP Module as a baud clock.

TABLE 7-1:

Address

Name

REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER

Bit 7

GIE

鈥?/div>

Timer2 register

鈥?/div>

TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1

Bit 6

PEIE

ADIF

ADIE

Bit 5

T0IE

鈥?/div>

Bit 4

INTE

鈥?/div>

Bit 3

RBIE

SSPIF

SSPIE

Bit 2

T0IF

CCP1IF

CCP1IE

Bit 1

INTF

TMR2IF

TMR2IE

Bit 0

RBIF

TMR1IF

TMR1IE

Value on:

POR,

BOR

Value on

all other

resets

0Bh,8Bh,

INTCON

10Bh,18Bh

0Ch

8Ch

11h

12h

92h

PIR1

PIE1

TMR2

T2CON

PR2

0000 000x 0000 000u

-0-- 0000 -0-- 0000

0000 0000 0000 0000

T2CKPS0

-000 0000 -000 0000

1111 1111 1111 1111

Timer2 Period Register

Legend:

= unknown,

= unchanged,

= unimplemented read as 鈥?鈥? Shaded cells are not used by the Timer2 module.

DS41120A-page 54

Advanced Information

漏

1999 Microchip Technology Inc.

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