PIC16C923-08I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C923-08I/SP

8-Bit CMOS Microcontroller with LCD Driver

Microchip Technology 

PIC16C9XX

8.5 Resetting Timer1 using the 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.

Note:

The special event trigger from the CCP1

module will not set interrupt flag bit

TMR1IF (PIR1<0>).

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 CCPR1H:CCPR1L regis-

ters pair effectively becomes the period register for

Timer1.

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

0Bh, 8Bh, INTCON

10Bh, 18Bh

0Ch

PIR1

8Ch

PIE1

0Eh

TMR1L

0Fh

TMR1H

10h

T1CON

GIE PEIE

T0IE

INTE

RBIE

T0IF

INTF

LCDIF ADIF(1)

—

LCDIE ADIE(1)

—

—

SSPIF CCP1IF TMR2IF

—

SSPIE CCP1IE TMR2IE

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

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

—

— T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS

RBIF

TMR1IF

TMR1IE

TMR1ON

0000 000x

00-- 0000

00-- 0000

xxxx xxxx

xxxx xxxx

--00 0000

Legend: x = 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.

Value on

all other

resets

0000 000u

00-- 0000

00-- 0000

uuuu uuuu

uuuu uuuu

--uu uuuu

DS30444E - page 54

© 1997 Microchip Technology Inc.

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