參數(shù)資料
型號: 25C256
廠商: Microchip Technology Inc.
英文描述: 256K 5.0V SPI Bus Serial EEPROM(4.5~5.5V,256K位,SPI總線串行EEPROM)
中文描述: 256K 5.0V SPI總線串行EEPROM(4.5?5.5V的,256K位和SPI總線串行EEPROM的)
文件頁數(shù): 22/170頁
文件大?。?/td> 4191K
代理商: 25C256
PIC16F62X
DS40300C-page 20
Preliminary
2003 Microchip Technology Inc.
3.2.2.2
OPTION Register
The OPTION register is a readable and writable
register which contains various control bits to configure
the TMR0/WDT prescaler, the external RB0/INT
interrupt, TMR0, and the weak pull-ups on PORTB.
REGISTER 3-2:
OPTION REGISTER (ADDRESS: 81h, 181h)
Note:
To achieve a 1:1 prescaler assignment for
TMR0, assign the prescaler to the WDT
(PSA = 1). See Section 6.3.1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
bit 7
bit 0
bit 7
RBPU
: PORTB Pull-up Enable bit
1
= PORTB pull-ups are disabled
0
= PORTB pull-ups are enabled by individual port latch values
bit 6
INTEDG
: Interrupt Edge Select bit
1
= Interrupt on rising edge of RB0/INT pin
0
= Interrupt on falling edge of RB0/INT pin
bit 5
T0CS
: TMR0 Clock Source Select bit
1
= Transition on RA4/T0CKI pin
0
= Internal instruction cycle clock (CLKOUT)
bit 4
T0SE
: TMR0 Source Edge Select bit
1
= Increment on high-to-low transition on RA4/T0CKI pin
0
= Increment on low-to-high transition on RA4/T0CKI pin
bit 3
PSA
: Prescaler Assignment bit
1
= Prescaler is assigned to the WDT
0
= Prescaler is assigned to the Timer0 module
bit 2-0
PS2:PS0
: Prescaler Rate Select bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
’1’ = Bit is set
’0’ = Bit is cleared
x = Bit is unknown
000
001
010
011
100
101
110
111
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
1 : 1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
Bit Value
TMR0 Rate
WDT Rate
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