參數(shù)資料
型號: PIC16F83
廠商: Microchip Technology Inc.
英文描述: 8-Bit CMOS Flash/EEPROM Microcontollrs(每個I/O口有20mA吸收,25mA驅(qū)動,64字節(jié)數(shù)據(jù)EEPROM,2.0V的微控制器)
中文描述: 8位CMOS閃存/ EEPROM Microcontollrs(每個的I / O口有20mA的吸收,25mA電流驅(qū)動,64字節(jié)數(shù)據(jù)的EEPROM,2.0伏的微控制器)
文件頁數(shù): 31/120頁
文件大?。?/td> 764K
代理商: PIC16F83
1996 Microchip Technology Inc.
DS30430A-page 31
PIC16F8X
6.3.1
SWITCHING PRESCALER ASSIGNMENT
The prescaler assignment is fully under software
control (i.e., it can be changed “on the fly” during
program execution).
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0
WDT)
BCF STATUS, RP0 ;Bank 0
CLRF TMR0 ;Clear TMR0
; and Prescaler
BSF STATUS, RP0 ;Bank 1
CLRWDT ;Clears WDT
MOVLW b'xxxx1xxx' ;Select new
MOVWF OPTION ; prescale value
BCF STATUS, RP0 ;Bank 0
Note:
To avoid an unintended device RESET,
the
following
instruction
(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.
sequence
EXAMPLE 6-2:
CHANGING PRESCALER
(WDT
TIMER0)
CLRWDT ;Clear WDT and
; prescaler
BSF STATUS, RP0 ;Bank 1
MOVLW b'xxxx0xxx' ;Select TMR0, new
; prescale value
’ and clock source
MOVWF OPTION ;
BCF STATUS, RP0 ;Bank 0
TABLE 6-1:
REGISTERS ASSOCIATED WITH TIMER0
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on all
other resets
01h
TMR0
Timer0 module’s register
xxxx xxxx
uuuu uuuu
0Bh
INTCON
GIE
EEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0000 0000
81h
OPTION
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
1111 1111
85h
TRISA
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
---1 1111
---1 1111
Legend:
x
= unknown,
u
= unchanged.
-
= unimplemented read as '0'. Shaded cells are not associated with Timer0.
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