PIC16C925-SSLASHCL datasheet(49/182 Pages) MICROCHIP

49 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 47

PIC16C925/926

6.0

TIMER1 MODULE

Timer1 is a 16-bit timer/counter consisting of two 8-bit

registers (TMR1H and TMR1L), which are readable

and

writable.

The

TMR1

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 turned on and off using the control bit

TMR1ON (T1CON<0>).

Timer1 also has an internal “RESET input”. This

RESET can be generated by the CCP module

(Section 8.0). Register 6-1 shows the Timer1 control

When the Timer1 oscillator is enabled (T1OSCEN is

set), the RC1/T1OSI and RC0/T1OSO/T1CKI pins

become inputs, regardless of the TRISC<1:0>. RC1

and RC0 will be read as ‘0’.

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

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

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 T1CKI (on the rising edge)

= Internal clock (FOSC/4)

bit 0

TMR1ON: Timer1 On bit

= Enables Timer1

= Stops Timer1

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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