參數(shù)資料
型號: 16F630
廠商: Microchip Technology Inc.
英文描述: 14-Pin FLASH-Based 8-Bit CMOS Microcontrollers
中文描述: 14引腳基于閃存的8位CMOS微控制器
文件頁數(shù): 14/132頁
文件大?。?/td> 2651K
代理商: 16F630
PIC16F630/676
DS40039C-page 12
2003 Microchip Technology Inc.
2.2.2.2
OPTION Register
The OPTION register is a readable and writable
register, which contains various control bits to
configure:
TMR0/WDT prescaler
External RA2/INT interrupt
TMR0
Weak pull-ups on PORTA
REGISTER 2-2:
OPTION_REG — OPTION REGISTER (ADDRESS: 81h)
Note:
To achieve a 1:1 prescaler assignment for
TMR0, assign the prescaler to the WDT by
setting PSA bit to ‘1’ (OPTION<3>). See
Section 4.4.
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
RAPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
bit 7
bit 0
bit 7
RAPU:
PORTA Pull-up Enable bit
1
= PORTA pull-ups are disabled
0
= PORTA pull-ups are enabled by individual port latch values
bit 6
INTEDG:
Interrupt Edge Select bit
1
= Interrupt on rising edge of RA2/INT pin
0
= Interrupt on falling edge of RA2/INT pin
bit 5
T0CS:
TMR0 Clock Source Select bit
1
= Transition on RA2/T0CKI pin
0
= Internal instruction cycle clock (CLKOUT)
bit 4
T0SE:
TMR0 Source Edge Select bit
1
= Increment on high-to-low transition on RA2/T0CKI pin
0
= Increment on low-to-high transition on RA2/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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