PIC16F870_13 Datasheet, PDF(54/172 Page) Microchip Technology – 28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

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PIC16F870_13 Datasheet, PDF (54/172 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

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PIC16F870/871

7.1 Timer2 Prescaler and Postscaler

The prescaler and postscaler counters are cleared

when any of the following occurs:

â¢ a write to the TMR2 register

â¢ a write to the T2CON register

â¢ any device RESET (POR, MCLR Reset, WDT

Reset, or BOR)

TMR2 is not cleared when T2CON is written.

7.2 Output of TMR2

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

SSP module, which optionally uses it to generate shift

clock.

TABLE 7-1: 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

0Ch

PIR1 PSPIF(1)

8Ch

PIE1 PSPIE(1)

PEIE

ADIF

ADIE

T0IE

RCIF

RCIE

INTE

TXIF

TXIE

RBIE

T0IF

INTF

RBIF 0000 000x 0000 000u

CCP1IF TMR2IF TMR1IF 0000 -000 0000 -000

â CCP1IE TMR2IE TMR1IE 0000 -000 0000 -000

11h

TMR2 Timer2 Moduleâs Register

0000 0000 0000 0000

12h

T2CON â 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: Bits PSPIE and PSPIF are reserved on the PIC16F870; always maintain these bits clear.

DS30569C-page 54

ï£ 2000-2013 Microchip Technology Inc.

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