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PIC16F628-20/SS 데이터시트(PDF) 49 Page - Microchip Technology

부품명 PIC16F628-20/SS
상세설명  FLASH-Based 8-Bit CMOS Microcontrollers
PDF  160 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F628-20/SS 데이터시트(HTML) 49 Page - Microchip Technology

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© 1999 Microchip Technology Inc.
Preliminary
DS40300B-page 49
PIC16F62X
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)
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
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)
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
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
Value on
All Other
Resets
01h
TMR0
Timer0 module register
xxxx xxxx
uuuu uuuu
0Bh/8Bh/
10Bh/18Bh
INTCON
GIE
—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
TRISA
TRISA7
TRISA6
—
TRISA4 TRISA3
TRISA2
TRISA1
TRISA0
11-1 1111
11-1 1111
Legend: — = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown
Note:
Shaded bits are not used by TMR0 module.



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