PIC18F442T-E/ML【PDF 85/134 页】IC MCU FLASH 8KX16 EE A/D 44QFN

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Sheet目录3882

81页 82页 83页 84页 [85页]86页 87页 88页 89页

PIC16C9XX

DS30444E - page 54

1997 Microchip Technology Inc.

8.5

Resetting Timer1 using the CCP

Trigger Output

If the CCP1 module is congured in compare mode to

generate a “special event trigger" (CCP1M3:CCP1M0

= 1011), this signal will reset Timer1.

Timer1 must be congured 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 CCPR1H:CCPR1L regis-

ters pair effectively becomes the period register for

Timer1.

Note:

The special event trigger from the CCP1

module will not set interrupt ag bit

TMR1IF (PIR1<0>).

8.6

Resetting of Timer1 Register Pair

(TMR1H:TMR1L)

TMR1H and TMR1L registers are not reset on a POR

or any other reset except by the CCP1 special event

trigger.

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

any other reset, the register is unaffected.

8.7

Timer1 Prescaler

The prescaler counter is cleared on writes to the

TMR1H or TMR1L registers.

TABLE 8-2: 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

Power-on

Reset

Value on

all other

resets

0Bh, 8Bh,

10Bh, 18Bh

INTCON

GIE

PEIE

T0IE

INTE

RBIE

T0IF

INTF

RBIF

0000 000x

0000 000u

0Ch

PIR1

LCDIF

ADIF(1)

—

SSPIF

CCP1IF

TMR2IF

TMR1IF

00-- 0000

8Ch

PIE1

LCDIE

ADIE(1)

—

SSPIE

CCP1IE

TMR2IE

TMR1IE

00-- 0000

0Eh

TMR1L

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

xxxx xxxx

uuuu uuuu

0Fh

TMR1H

Holding register for the Most Signicant 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 theTimer1 module.

Note

1: Bits ADIE and ADIF are reserved on the PIC16C923, always maintain these bits clear.

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