PIC16C62B-20/SS【PDF 40/120 页】IC MCU OTP 2KX14 PWM 28SSOP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录3855

36页 37页 38页 39页 [40页]41页 42页 43页 44页

PIC16C62B/72A

DS35008B-page 26

Preliminary

1999 Microchip Technology Inc.

4.2.1

SWITCHING PRESCALER ASSIGNMENT

The prescaler assignment is fully under software con-

trol, (i.e., it can be changed “on-the-fly” during program

execution).

4.3

Timer0 Interrupt

The TMR0 interrupt is generated when the TMR0 reg-

ister overflows from FFh to 00h. This overflow sets bit

T0IF (INTCON<2>). The interrupt can be masked by

clearing bit T0IE (INTCON<5>). Bit T0IF must be

cleared in software by the Timer0 module interrupt ser-

vice routine before re-enabling this interrupt. The

TMR0 interrupt cannot awaken the processor from

SLEEP since the timer is shut off during SLEEP.

FIGURE 4-2:

BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER

TABLE 4-1

REGISTERS ASSOCIATED WITH TIMER0

Note:

To avoid an unintended device RESET, a

specific instruction sequence (shown in the

PICmicro Mid-Range Reference Man-

ual, DS33023) must be executed when

changing the prescaler assignment from

Timer0 to the WDT. This sequence must

be followed even if the WDT is disabled.

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on:

POR,

BOR

Value on all

other resets

01h

TMR0

Timer0 module’s register

xxxx xxxx

uuuu uuuu

0Bh,8Bh

INTCON

GIE

PEIE

T0IE

INTE

RBIE

T0IF

INTF

RBIF

0000 000x

0000 000u

81h

OPTION_REG

RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

85h

TRISA

—

PORTA Data Direction Register

--11 1111

Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by Timer0.

RA4/T0CKI

T0SE

CLKOUT (= Fosc/4)

SYNC

TCY

TMR0 reg

8-bit Prescaler

8 - to - 1MUX

M U X

Watchdog

Timer

PSA

WDT

Time-out

PS2:PS0

Note: T0CS, T0SE, PSA, PS2:PS0 are (OPTION_REG<5:0>).

PSA

WDT Enable bit

Data Bus

Set flag bit T0IF

on Overflow

PSA

T0CS

Prescaler

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式