參數(shù)資料
型號: PIC16C715
廠商: Microchip Technology Inc.
英文描述: 8-Bit CMOS Microcontroller with A/D Converter(每個I/O口有25mA驅(qū)動/吸收電流,微控制器)
中文描述: 8位CMOS微控制器與A / D轉(zhuǎn)換器(每個的I / O口有25毫安驅(qū)動/吸收電流,微控制器)
文件頁數(shù): 33/120頁
文件大?。?/td> 764K
代理商: PIC16C715
1996 Microchip Technology Inc.
Advance Information
DS30560A-page 33
PIC16C715
6.3.1
SWITCHING PRESCALER ASSIGNMENT
The prescaler assignment is fully under software con-
trol, i.e., it can be changed “on the fly” during program
execution.
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0
WDT)
BCF STATUS, RP0 ;Bank 0
CLRF TMR0 ;Clear TMR0 & Prescaler
BSF STATUS, RP0 ;Bank 1
CLRWDT ;Clears WDT
MOVLW b'xxxx1xxx' ;Select new prescale
MOVWF OPTION_REG ;value & WDT
BCF STATUS, RP0 ;Bank 0
Note:
To avoid an unintended device RESET, the
following instruction sequence (shown in
Example 6-1) 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 6-2.
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
MOVWF OPTION_REG ;clock source
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:
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
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
1111 1111
85h
Legend:
TRISA
= unknown,
TRISA4 TRISA3 TRISA2 TRISA1 TRISA0
= unimplemented locations read as '0'. Shaded cells are not used by Timer0.
---1 1111
---1 1111
x
u
= unchanged,
-
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