PIC16F684 datasheet(83/192 Pages) MICROCHIP

83 / 192 page

DS41202F-page 81

PIC16F684

11.2

Compare Mode

In Compare mode, the 16-bit CCPR1 register value is

constantly compared against the TMR1 register pair

value. When a match occurs, the CCP module may:

• Toggle the CCP1 output

• Set the CCP1 output

• Clear the CCP1 output

• Generate a Special Event Trigger

• Generate a Software Interrupt

The action on the pin is based on the value of the

CCP1M<3:0> control bits of the CCP1CON register.

All Compare modes can generate an interrupt.

FIGURE 11-2:

COMPARE MODE

OPERATION BLOCK

DIAGRAM

11.2.1

CCP1 PIN CONFIGURATION

The user must configure the CCP1 pin as an output by

clearing the associated TRIS bit.

11.2.2

TIMER1 MODE SELECTION

In Compare mode, Timer1 must be running in either

Timer mode or Synchronized Counter mode. The

compare operation may not work in Asynchronous

Counter mode.

11.2.3

SOFTWARE INTERRUPT MODE

When Generate Software Interrupt mode is chosen

(CCP1M<3:0> = 1010), the CCP module does not

assert control of the CCP1 pin (see the CCP1CON

11.2.4

SPECIAL EVENT TRIGGER

When

Special

Event

Trigger

mode

chosen

(CCP1M<3:0> = 1011), the CCP module does the

following:

• Resets Timer1

• Starts an ADC conversion if ADC is enabled

The CCP module does not assert control of the CCP1

pin in this mode (see the CCP1CON register).

The Special Event Trigger output of the CCP occurs

immediately upon a match between the TMR1H,

TMR1L register pair and the CCPR1H, CCPR1L

reset until the next rising edge of the Timer1 clock. This

allows

the

CCPR1H,

CCPR1L

pair

effectively provide a 16-bit programmable period

Note:

Clearing the CCP1CON register will force

the CCP1 compare output latch to the

default low level. This is not the port I/O

data latch.

CCPR1H CCPR1L

TMR1H

TMR1L

Comparator

Output

Logic

Special Event Trigger

Set CCP1IF Interrupt Flag

(PIR1)

Match

TRIS

CCP1CON<3:0>

Mode Select

Output Enable

Special Event Trigger will:

•

Clear TMR1H and TMR1L registers.

•

NOT set interrupt flag bit TMR1IF of the PIR1 register.

•

Set the GO/DONE bit to start the ADC conversion.

CCP1

Note 1: The Special Event Trigger from the CCP

module does not set interrupt flag bit

TMR1IF of the PIR1 register.

2: Removing

the

match

condition

changing the contents of the CCPR1H

and CCPR1L register pair, between the

clock edge that generates the Special

Event Trigger and the clock edge that

generates the Timer1 Reset, will preclude

the Reset from occurring.

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