PIC16C621A Datasheet

IC型号：
PIC16C621A
PDF描述：
EPROM-Based 8-Bit CMOS Microcontrollers
文件大小：
2148.18KB
PDF页数：
128页
芯片厂家：
Microchip

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PIC16C62X

6.3.1

SWITCHING PRESCALER ASSIGNMENT

The prescaler assignment is fully under software

control (i.e., it can be changed 鈥渙n the 铿倅鈥?during

program execution). To avoid an unintended device

RESET,

the

following

instruction

sequence

(Example 6-1) must be executed when changing the

prescaler assignment from Timer0 to WDT.

To change prescaler from the WDT to the TMR0

module use the sequence shown in Example 6-2. This

precaution must be taken even if the WDT is disabled.

EXAMPLE 6-2:

CHANGING PRESCALER

(WDT鈫扵IMER0)

;Clear WDT and

;prescaler

CLRWDT

EXAMPLE 6-1:

1.BCF

CHANGING PRESCALER

(TIMER0鈫扺DT)

BSF

MOVLW

STATUS, RP0

b'xxxx0xxx'

STATUS, RP0 ;Skip if already in

; Bank 0

2.CLRWDT

;Clear WDT

3.CLRF

TMR0

;Clear TMR0 & Prescaler

4.BSF

STATUS, RP0 ;Bank 1

5.MOVLW '00101111鈥檅; ;These 3 lines (5, 6, 7)

6.MOVWF OPTION

; are required only if

; desired PS<2:0> are

7.CLRWDT

; 000 or 001

8.MOVLW '00101xxx鈥檅 ;Set Postscaler to

9.MOVWF OPTION

; desired WDT rate

10.BCF

STATUS, RP0 ;Return to Bank 0

;Select TMR0, new

;prescale value and

;clock source

MOVWF

BCF

OPTION_REG

STATUS, RP0

TABLE 6-1:

Address

01h

0Bh/8Bh

81h

85h

Name

TMR0

REGISTERS ASSOCIATED WITH TIMER0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR

Value on

All Other

Resets

Timer0 module register

GIE

RBPU

鈥?/div>

PEIE

INTEDG

鈥?/div>

T0IE

T0CS

鈥?/div>

INTE

T0SE

TRISA4

RBIE

PSA

TRISA3

T0IF

PS2

TRISA2

INTF

PS1

TRISA1

RBIF

PS0

TRISA0

xxxx xxxx uuuu uuuu

0000 000x 0000 000u

1111 1111 1111 1111

---1 1111 ---1 1111

INTCON

OPTION

TRISA

Legend: 鈥?= Unimplemented locations, read as 鈥?鈥?

Note:

Shaded bits are not used by TMR0 module.

u = unchanged

x = unknown

漏

1998 Microchip Technology Inc.

Preliminary

DS30235G-page 35

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