PIC16F628-20SLASHSS datasheet(53/160 Pages) MICROCHIP

53 / 160 page

Preliminary

DS40300B-page 53

PIC16F62X

7.5

Resetting Timer1 using a CCP Trigger

Output

If the CCP1 module is configured in compare mode to

generate a “special event trigger" (CCP1M3:CCP1M0

= 1011), this signal will reset Timer1.

Timer1 must be configured for either timer or synchro-

nized counter mode to take advantage of this feature. If

Timer1 is running in asynchronous counter mode, this

reset operation may not work.

In the event that a write to Timer1 coincides with a spe-

cial event trigger from CCP1, the write will take prece-

dence.

In this mode of operation, the CCPRxH:CCPRxL regis-

ters pair effectively becomes the period register for

Timer1.

Note:

The special event triggers from the CCP1

module will not set interrupt flag bit

TMR1IF (PIR1<0>).

7.6

Resetting of Timer1 Register Pair

(TMR1H, TMR1L)

TMR1H and TMR1L registers are not reset to 00h on a

POR or any other reset except by the CCP1 special

event triggers.

T1CON register is reset to 00h on a Power-on Reset or

a Brown-out Reset, which shuts off the timer and

leaves a 1:1 prescale. In all other resets, the register is

unaffected.

7.7

Timer1 Prescaler

The prescaler counter is cleared on writes to the

TMR1H or TMR1L registers.

TABLE 7-2:

REGISTERS ASSOCIATED WITH TIMER1 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

Value on

all other

resets

0Bh/8Bh/

10Bh/18Bh

INTCON

GIE

PEIE

T0IE

INTE

RBIE

T0IF

INTF

RBIF

0000 000x

0000 000u

0Ch

PIR1

EEIF

CMIF

RCIF

TXIF

—

CCP1IF

TMR2IF

TMR1IF

0000 -000

8Ch

PIE1

EEIE

CMIE

RCIE

TXIE

—

CCP1IE

TMR2IE

TMR1IE

0000 -000

0Eh

TMR1L

Holding register for the Least Significant Byte of the 16-bit TMR1 register

xxxx xxxx

uuuu uuuu

0Fh

TMR1H

Holding register for the Most Significant Byte of the 16-bit TMR1 register

xxxx xxxx

uuuu uuuu

10h

T1CON

—

T1CKPS1 T1CKPS0

T1OSCEN

T1SYNC

TMR1CS

TMR1ON

--00 0000

--uu uuuu

Legend:

= unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by the Timer1 module.

PIC16F628-20/SS датащи(PDF) 53 Page - Microchip Technology

PIC16F628-20/SS датащи(HTML) 53 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL