PIC1F628 datasheet(48/170 Pages) MICROCHIP

48 / 170 page

PIC16F62X

DS40300C-page 46

Preliminary

 2003 Microchip Technology Inc.

7.0

TIMER1 MODULE

The Timer1 module is a 16-bit timer/counter consisting

of two 8-bit registers (TMR1H and TMR1L) which are

readable and writable. The TMR1 Register pair

(TMR1H:TMR1L) increments from 0000h to FFFFh

and rolls over to 0000h. The TMR1 Interrupt, if enabled,

is generated on overflow which is latched in interrupt

flag bit TMR1IF (PIR1<0>). This interrupt can be

enabled/disabled by setting/clearing TMR1 interrupt

enable bit TMR1IE (PIE1<0>).

Timer1 can operate in one of two modes:

• As a timer

• As a counter

The Operating mode is determined by the clock select

bit, TMR1CS (T1CON<1>).

In Timer mode, Timer1 increments every instruction

cycle. In Counter mode, it increments on every rising

edge of the external clock input.

Timer1 can be enabled/disabled by setting/clearing

control bit TMR1ON (T1CON<0>).

Timer1 also has an internal “RESET input”. This

RESET can be generated by the CCP module

(Section 11.0). Register 7-1 shows the Timer1 Control

For the PIC16F627 and PIC16F628, when the Timer1

oscillator is enabled (T1OSCEN is set), the RB7/T1OSI

and RB6/T1OSO/T1CKI pins become inputs. That is,

the TRISB<7:6> value is ignored.

T1CON: TIMER1 CONTROL REGISTER (ADDRESS: 10h)

U-0

R/W-0

—

T1CKPS1 T1CKPS0

T1OSCEN

T1SYNC TMR1CS TMR1ON

bit 7

bit 0

bit 7-6

Unimplemented: Read as '0'

bit 5-4

T1CKPS1:T1CKPS0: Timer1 Input Clock Prescale Select bits

= 1:8 Prescale value

= 1:4 Prescale value

= 1:2 Prescale value

= 1:1 Prescale value

bit 3

T1OSCEN: Timer1 Oscillator Enable Control bit

= Oscillator is enabled

= Oscillator is shut off(1)

bit 2

T1SYNC: Timer1 External Clock Input Synchronization Control bit

TMR1CS = 1

= Do not synchronize external clock input

= Synchronize external clock input

TMR1CS = 0

This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.

bit 1

TMR1CS: Timer1 Clock Source Select bit

= External clock from pin RB6/T1OSO/T1CKI (on the rising edge)

= Internal clock (F

OSC/4)

bit 0

TMR1ON: Timer1 On bit

= Disables Timer1

= Stops Timer1

Note 1: The oscillator inverter and feedback resistor are turned off to eliminate power drain.

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

PIC1F628 Datasheet(PDF) 48 Page - Microchip Technology

PIC1F628 Datasheet(HTML) 48 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

Datasheet Download

Link URL