參數(shù)資料
型號(hào)： 25C128
廠商： Microchip Technology Inc.
英文描述： 128K 5.0V SPI Bus Serial EEPROM(4.5~5.5V,128K位,SPI總線串行EEPROM)
中文描述： 128K的5.0V SPI總線串行EEPROM（4.5?5.5V的，128K的位和SPI總線串行EEPROM的）
文件頁數(shù)： 47/170頁
文件大?。?/td> 4191K
代理商： 25C128
2003 Microchip Technology Inc.
Preliminary
DS40300C-page 45
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). Use the instruction sequences,
shown in Example 6-1, when changing the prescaler
assignment from Timer0 to WDT, to avoid an
unintended device RESET.
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0
→
WDT)
BCF
STATUS, RP0
;Skip if already in
;Bank 0
;Clear WDT
;Clear TMR0 & Prescaler
;Bank 1
;These 3 lines
;(5, 6, 7)
;are required only
;if desired PS<2:0>
;are
;000 or 001
;Set Postscaler to
;desired WDT rate
;Return to Bank 0
CLRWDT
CLRF
BSF
MOVLW
TMR0
STATUS, RP0
'00101111’b
MOVWF
OPTION_REG
CLRWDT
MOVLW
MOVWF
BCF
'00101xxx’b
OPTION_REG
STATUS, RP0
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
MOVLW
STATUS, RP0
b'xxxx0xxx'
;Select TMR0, new
;prescale value and
;clock source
MOVWF
BCF
OPTION_REG
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
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x 0000 000u
81h, 181h
OPTION
(2)
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111 1111 1111
85h
TRISA
TRISA7
TRISA6
TRISA5 TRISA4 TRISA3
TRISA2
TRISA1
TRISA0
1111 1111 1111 1111
Legend:
Note
— = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown
Shaded bits are not used by TMR0 module.
Option is referred by
OPTION_REG
in MPLAB.
1:
2:
相關(guān)PDF資料
PDF描述
25LC128 128K 5.0V SPI Bus Serial EEPROM(2.5~5.5V,128K位,SPI總線串行EEPROM)
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