PIC16F946-ESLASHMLQTP datasheet(104/330 Pages) MICROCHIP

104 / 330 page

PIC16F913/914/916/917/946

DS41250F-page 102

6.0

TIMER1 MODULE WITH GATE

CONTROL

The Timer1 module is a 16-bit timer/counter with the

following features:

• 16-bit timer/counter register pair (TMR1H:TMR1L)

• Programmable internal or external clock source

• 3-bit prescaler

• Optional LP oscillator

• Synchronous or asynchronous operation

• Timer1 gate (count enable) via comparator or

T1G pin

• Interrupt on overflow

• Wake-up on overflow (external clock,

Asynchronous mode only)

• Clock source for LCD module

Figure 6-1 is a block diagram of the Timer1 module.

6.1

Timer1 Operation

The Timer1 module is a 16-bit incrementing counter

which is accessed through the TMR1H:TMR1L register

pair. Writes to TMR1H or TMR1L directly update the

counter.

When used with an internal clock source, the module is

a timer. When used with an external clock source, the

module can be used as either a timer or counter.

6.2

Clock Source Selection

The TMR1CS bit of the T1CON register is used to select

the clock source. When TMR1CS = 0, the clock source

is FOSC/4. When TMR1CS = 1, the clock source is

supplied externally.

FIGURE 6-1:

TIMER1 BLOCK DIAGRAM

Clock Source

TMR1CS

FOSC/4

T1CKI pin

TMR1H

TMR1L

T1SYNC

T1CKPS<1:0>

Prescaler

1, 2, 4, 8

Synchronized

clock input

Set flag bit

TMR1IF on

Overflow

TMR1(2)

TMR1GE

TMR1ON

SYNCC2OUT(4)

T1GSS

T1GINV

To C2 Comparator Module

Timer1 Clock

Note 1:

ST Buffer is low power type when using LP oscillator, or high speed type when using T1CKI.

Timer1 register increments on rising edge.

Synchronize does not operate while in Sleep.

SYNCC2OUT is synchronized when the C2SYNC bit of the CMCON1 register is set.

T1G

LP OSC

FOSC/4

Internal

Clock

OSC1/T1OSI

OSC2/T1OSO

FOSC = 000

T1OSCEN

FOSC = x00

T1CKI

TMR1CS

(1)

To LCD Module

Synchronize(3)

det

PIC16F946-E/MLQTP датащи(PDF) 104 Page - Microchip Technology

PIC16F946-E/MLQTP датащи(HTML) 104 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