PIC16F87X Datasheet

IC型号：
PIC16F87X
PDF描述：
28/40-pin 8-Bit CMOS FLASH Microcontrollers
文件大小：
1377.31KB
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PIC16F87X

6.0

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:

鈥?As a timer

鈥?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 鈥渞eset input鈥? This reset can

be generated by either of the two CCP modules

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

When the Timer1 oscillator is enabled (T1OSCEN is

set), the RC1/T1OSI/CCP2 and RC0/T1OSO/T1CKI

pins become inputs. That is, the TRISC<1:0> value is

ignored.

Additional information on timer modules is available in

the PICmicro鈩?Mid-range MCU Family Reference

Manual (DS33023).

U-0

鈥?/div>

bit7

U-0

鈥?/div>

R/W-0

T1SYNC

R/W-0

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n = Value at POR reset

T1CKPS1 T1CKPS0 T1OSCEN

TMR1CS TMR1ON

bit 7-6:

Unimplemented:

Read as 鈥?鈥?/div>

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 (The oscillator inverter is turned off to eliminate power drain)

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 RC0/T1OSO/T1CKI (on the rising edge)

= Internal clock (F

OSC

/4)

TMR1ON:

Timer1 On bit

= Enables Timer1

= Stops Timer1

bit 2:

bit 0:

漏

1999 Microchip Technology Inc.

DS30292B-page 51

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