參數(shù)資料
型號： PIC16LCR620AT-04I/SO
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, RISC MICROCONTROLLER, PDSO18
封裝： 0.300 INCH, PLASTIC, MS-013, SO-18
文件頁數(shù)： 60/128頁
文件大?。?/td> 3677K
代理商： PIC16LCR620AT-04I/SO
2003 Microchip Technology Inc.
DS30235J-page 35
PIC16C62X
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). 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.
)
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0→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→TIMER0)
TABLE 6-1:
REGISTERS ASSOCIATED WITH TIMER0
1.BCF
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’b;
;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’b
;Set Postscaler to
9.MOVWF
OPTION
;desired WDT rate
10.BCF
STATUS, RP0
;Return to Bank 0
CLRWDT
;Clear WDT and
;prescaler
BSF
STATUS, RP0
MOVLW
b'xxxx0xxx'
;Select TMR0, new
;prescale value and
;clock source
MOVWF
OPTION_REG
BCF
STATUS, RP0
Address Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR
Value on
All Other
RESETS
01h
TMR0
Timer0 module 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
85h
TRISA
—
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0 ---1 1111
---1 1111
Legend: — = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown
Note:
Shaded bits are not used by TMR0 module.
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