PIC16LC771 datasheet(47/224 Pages) MICROCHIP

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DS41120C-page 47

PIC16C717/770/771

6.0

TIMER1 MODULE

The Timer1 module timer/counter has the following fea-

tures:

• 16-bit timer/counter

(Two 8-bit registers; TMR1H and TMR1L)

• Readable and writable (Both registers)

• Internal or external clock select

• Interrupt on overflow from FFFFh to 0000h

• RESET from ECCP module trigger

Timer1 has a control register, shown in Register 6-1.

Timer1 can be enabled/disabled by setting/clearing

control bit TMR1ON (T1CON<0>).

Figure 6-2 is a simplified block diagram of the Timer1

module.

Additional information on timer modules is available in

the PIC Mid-Range MCU Family Reference Manual,

(DS33023).

6.1

Timer1 Operation

Timer1 can operate in one of these modes:

•As a timer

• As a synchronous counter

• As an asynchronous 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 CONTROL REGISTER (T1CON: 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

T1CKPS<1:0>: 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 /P1C (on the rising edge)

= Internal clock (FOSC/4)

bit 0

TMR1ON: Timer1 On bit

= Enables 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

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