PIC12CE674 Datasheet

IC型号：
PIC12CE674
PDF描述：
8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEP...
文件大小：
1264.35KB
PDF页数：
129页
芯片厂家：
Microchip

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PIC12CE67X

7.3.1

SWITCHING PRESCALER ASSIGNMENT

The prescaler assignment is fully under software con-

trol, i.e., it can be changed 鈥渙n the 铿倅鈥?during program

execution.

Note:

To avoid an unintended device RESET, the

following instruction sequence (shown in

Example 7-1) must be executed when

changing the prescaler assignment from

Timer0 to the WDT. This sequence must

be followed even if the WDT is disabled.

To change prescaler from the WDT to the Timer0 mod-

ule use the sequence shown in Example 7-2.

EXAMPLE 7-2:

CLRWDT

BSF

MOVLW

MOVWF

BCF

CHANGING PRESCALER

(WDT鈫扵IMER0)

;Clear WDT and

;prescaler

STATUS, RP0 ;Bank 1

b'xxxx0xxx' ;Select TMR0, new

;prescale value and

OPTION_REG ;clock source

STATUS, RP0 ;Bank 0

EXAMPLE 7-1:

BCF

CLRF

BSF

CLRWDT

MOVLW

MOVWF

BCF

CHANGING PRESCALER

(TIMER0鈫扺DT)

;Bank 0

;Clear TMR0 & Prescaler

;Bank 1

;Clears WDT

;Select new prescale

;value & WDT

;Bank 0

STATUS, RP0

TMR0

STATUS, RP0

b'xxxx1xxx'

OPTION_REG

STATUS, RP0

TABLE 7-1:

Address Name

01h

0Bh/8Bh

81h

85h

TMR0

REGISTERS ASSOCIATED WITH TIMER0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR

xxxx xxxx

INTE

T0SE

TRIS4

GPIE

PSA

TRIS3

T0IF

PS2

TRIS2

INTF

PS1

TRIS1

GPIF

PS0

TRIS0

0000 000x

1111 1111

--11 1111

Value on

all other

Resets

uuuu uuuu

0000 000u

1111 1111

--11 1111

Timer0 module鈥檚 register

GIE

PEIE

T0IE

T0CS

TRIS5

INTCON

OPTION GPPU INTEDG

TRIS

鈥?/div>

Legend:

= unknown,

= unchanged,

= unimplemented locations read as '0'. Shaded cells are not used by Timer0.

漏

1998 Microchip Technology Inc.

Preliminary

DS40181B-page 35

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