PIC12F510/16F506
4.4
OPTION Register
The OPTION register is a 8-bit wide, write-only register,
that 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 1: 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 GPPU/RBPU
and GPWU/RBWU).
2: If the T0CS bit is set to ‘1’, it will override
the TRIS function on the T0CKI pin.
REGISTER 4-3:
OPTION REGISTER (PIC12F510)
W-1
W-1
W-1
W-1
W-1
W-1
PS2
W-1
PS1
W-1
PS0
GPWU
GPPU
T0CS
T0SE
PSA
bit 7
bit 0
bit 7
bit 6
GPWU: Enable Wake-up On Pin Change bit (GP0, GP1, GP3)
1= Disabled
0= Enabled
GPPU: Enable Weak Pull-ups bit (GP0, GP1, GP3)
1= Disabled
0= Enabled
bit 5
T0CS: Timer0 Clock Source Select bit
1= Transition on T0CKI pin
0= Internal instruction cycle clock (CLKOUT)
bit 4
T0SE: Timer0 Source Edge Select bit
1= Increment on high-to-low transition on T0CKI pin
0= Increment on low-to-high transition on 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
Bit Value
Timer0 Rate WDT Rate
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
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
DS41268B-page 20
Preliminary
© 2006 Microchip Technology Inc.
ETC [ ETC ]
