PIC16CR83 Datasheet

IC型号：
PIC16CR83
PDF描述：
18-pin Flash/EEPROM 8-Bit Microcontrollers
文件大小：
2018.18KB
PDF页数：
125页
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PIC16F8X

6.3.1

SWITCHING PRESCALER ASSIGNMENT

EXAMPLE 6-1:

BCF

CLRF

BSF

CLRWDT

MOVLW

MOVWF

BCF

The prescaler assignment is fully under software

control (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

(Example 6-1) must be executed when

changing the prescaler assignment from

Timer0 to the WDT. This sequence must

be taken even if the WDT is disabled. To

change prescaler from the WDT to the

Timer0 module use the sequence shown in

Example 6-2.

CHANGING PRESCALER

(TIMER0鈫扺DT)

;Bank 0

;Clear TMR0

; and Prescaler

;Bank 1

;Clears WDT

;Select new

; prescale value

;Bank 0

STATUS, RP0

TMR0

STATUS, RP0

b'xxxx1xxx'

OPTION_REG

STATUS, RP0

EXAMPLE 6-2:

CLRWDT

BSF

MOVLW

CHANGING PRESCALER

(WDT鈫扵IMER0)

;Clear WDT and

; prescaler

;Bank 1

;Select TMR0, new

; prescale value

鈥?and clock source

;

;Bank 0

STATUS, RP0

b'xxxx0xxx'

MOVWF

BCF

OPTION_REG

STATUS, RP0

TABLE 6-1

REGISTERS ASSOCIATED WITH TIMER0

Value on

Power-on

Reset

xxxx xxxx

T0IF

PS2

TRISA2

INTF

PS1

TRISA1

RBIF

PS0

TRISA0

0000 000x

1111 1111

---1 1111

Value on all

other resets

uuuu uuuu

0000 0000

1111 1111

---1 1111

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

01h

0Bh

81h

85h

TMR0

INTCON

OPTION_

REG

TRISA

GIE

RBPU

鈥?/div>

EEIE

INTEDG

鈥?/div>

T0IE

T0CS

鈥?/div>

Timer0 module鈥檚 register

INTE

T0SE

TRISA4

RBIE

PSA

TRISA3

Legend:

= unknown,

= unchanged.

= unimplemented read as '0'. Shaded cells are not associated with Timer0.

漏

1998 Microchip Technology Inc.

DS30430C-page 31

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