參數(shù)資料
型號(hào): PIC16C505-20/P
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDIP14
封裝: 0.300 INCH, PLASTIC, DIP-14
文件頁(yè)數(shù): 7/85頁(yè)
文件大?。?/td> 1205K
代理商: PIC16C505-20/P
1999 Microchip Technology Inc.
DS40192C-page 15
PIC16C505
4.4
OPTION Register
The OPTION register is a 8-bit wide, write-only
register, which
contains
various
control bits to
configure the Timer0/WDT prescaler and Timer0.
By executing the OPTION instruction, the contents of
the W register will be transferred to the OPTION
register. A RESET sets the OPTION<7:0> bits.
Note:
If TRIS bit is set to ‘0’, the wake-up on
change and pull-up functions are disabled
for that pin (i.e., note that TRIS overrides
OPTION control of RBPU and RBWU).
REGISTER 4-2:
OPTION REGISTER
W-1
RBWU
RBPU
T0CS
T0SE
PSA
PS2
PS1
PS0
R
= Readable bit
W = Writable bit
U
= Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7
6
5
4
3
2
1
bit0
bit 7:
RBWU: Enable wake-up on pin change (RB0, RB1, RB3, RB4)
1
= Disabled
0
= Enabled
bit 6:
RBPU: Enable weak pull-ups (RB0, RB1, RB3, RB4)
1
= Disabled
0
= Enabled
bit 5:
T0CS: Timer0 clock source select bit
1
= Transition on T0CKI pin (overrides TRIS <RC57>
0
= Transition on internal instruction cycle clock, Fosc/4
bit 4:
T0SE: Timer0 source edge select bit
1
= Increment on high to low transition on the T0CKI pin
0
= Increment on low to high transition on the T0CKI pin
bit 3:
PSA: Prescaler assignment bit
1
= Prescaler assigned to the WDT
0
= Prescaler assigned to Timer0
bit 2-0:
PS<2:0>: Prescaler rate select bits
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
Timer0 Rate
WDT Rate
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