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PIC12CE673-04/P 데이터시트(PDF) 35 Page - Microchip Technology

부품명 PIC12CE673-04/P
상세설명  8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory
PDF  116 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
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© 1998 Microchip Technology Inc.
Preliminary
DS40181B-page 35
PIC12CE67X
7.3.1
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 7-1:
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 7-1) 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 7-2.
EXAMPLE 7-2:
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 7-1:
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’s register
xxxx xxxx
uuuu uuuu
0Bh/8Bh
INTCON
GIE
PEIE
T0IE
INTE
GPIE
T0IF
INTF
GPIF
0000 000x
0000 000u
81h
OPTION
GPPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
1111 1111
85h
TRIS
—
—
TRIS5
TRIS4
TRIS3
TRIS2
TRIS1
TRIS0
--11 1111
--11 1111
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by Timer0.



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