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

7.0

TIMER2 MODULE

7.1

Timer2 Prescaler and Postscaler

Timer2 is an 8-bit timer with a prescaler and a

postscaler. It can be used as the PWM time-base for

the PWM mode of the CCP module(s). The TMR2 reg-

ister is readable and writable, and is cleared on any

device reset.

The input clock (F

OSC

/4) has a prescale option of 1:1,

1:4

1:16,

selected

control

bits

T2CKPS1:T2CKPS0 (T2CON<1:0>).

The Timer2 module has an 8-bit period register PR2.

Timer2 increments from 00h until it matches PR2 and

then resets to 00h on the next increment cycle. PR2 is

a readable and writable register. The PR2 register is ini-

tialized to FFh upon reset.

The match output of TMR2 goes through a 4-bit

postscaler (which gives a 1:1 to 1:16 scaling inclusive)

to generate a TMR2 interrupt (latched in flag bit

TMR2IF, (PIR1<1>)).

Timer2 can be shut off by clearing control bit TMR2ON

(T2CON<2>) to minimize power consumption.

Additional information on timer modules is available in

the PICmicro鈩?Mid-Range MCU Family Reference

Manual (DS33023).

Postscaler

1:1 to 1:16

T2OUTPS3:

T2OUTPS0

Comparator

The prescaler and postscaler counters are cleared

when any of the following occurs:

鈥?a write to the TMR2 register

鈥?a write to the T2CON register

鈥?any device reset (POR, MCLR reset, WDT reset

or BOR)

TMR2 is not cleared when T2CON is written.

7.2

Output of TMR2

The output of TMR2 (before the postscaler) is fed to the

SSPort module, which optionally uses it to generate

shift clock.

FIGURE 7-1:

Sets flag

bit TMR2IF

TIMER2 BLOCK DIAGRAM

TMR2

output

(1)

Reset

Prescaler

1:1, 1:4, 1:16

T2CKPS1:

T2CKPS0

TMR2 reg

OSC

PR2 reg

Note 1:

TMR2 register output can be software selected

by the SSP module as a baud clock.

U-0

鈥?/div>

bit7

R/W-0

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n = Value at POR reset

TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON

T2CKPS1 T2CKPS0

bit 7:

bit 6-3:

Unimplemented:

Read as '0'

TOUTPS3:TOUTPS0:

Timer2 Output Postscale Select bits

0000

= 1:1 Postscale

0001

= 1:2 Postscale

0010

= 1:3 Postscale

鈥?/div>

1111

= 1:16 Postscale

TMR2ON:

Timer2 On bit

= Timer2 is on

= Timer2 is off

T2CKPS1:T2CKPS0:

Timer2 Clock Prescale Select bits

= Prescaler is 1

= Prescaler is 4

= Prescaler is 16

bit 2:

bit 1-0:

漏

1999 Microchip Technology Inc.

DS30292B-page 55

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