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PIC16C641-04/SP Datasheet(PDF) 45 Page - Microchip Technology

Part # PIC16C641-04/SP
Description  8-Bit EPROM Microcontrollers with Analog Comparators
PDF  136 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16C641-04/SP Datasheet(HTML) 45 Page - Microchip Technology

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© 1996 Microchip Technology Inc.
Preliminary
DS30559A-page 45
PIC16C64X & PIC16C66X
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 precaution 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
TRISA
—
—
TRISA5
TRISA4 TRISA3 TRISA2 TRISA1 TRISA0
--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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