PIC16C505T-04/SL Ver la hoja de datos (PDF) - Microchip Technology
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PIC16C505T-04/SL Datasheet PDF : 85 Pages
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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
W-1
W-1
W-1
W-1
W-1
W-1
RBWU RBPU T0CS T0SE
PSA
PS2
PS1
bit7
6
5
4
3
2
1
bit 7:
bit 6:
bit 5:
bit 4:
bit 3:
bit 2-0:
RBWU: Enable wake-up on pin change (RB0, RB1, RB3, RB4)
1 = Disabled
0 = Enabled
RBPU: Enable weak pull-ups (RB0, RB1, RB3, RB4)
1 = Disabled
0 = Enabled
T0CS: Timer0 clock source select bit
1 = Transition on T0CKI pin (overrides TRIS <RC57>
0 = Transition on internal instruction cycle clock, Fosc/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
PSA: Prescaler assignment bit
1 = Prescaler assigned to the WDT
0 = Prescaler assigned to Timer0
PS<2:0>: Prescaler rate select bits
Bit Value Timer0 Rate WDT Rate
000
1:2
1:1
001
1:4
1:2
010
1:8
1:4
011
1 : 16
1:8
100
1 : 32
1 : 16
101
1 : 64
1 : 32
110
1 : 128
1 : 64
111
1 : 256
1 : 128
W-1
PS0
bit0
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
© 1999 Microchip Technology Inc.
DS40192C-page 15
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