PIC12F519 Datasheet, PDF (19/88 Pages) Microchip Technology – 8-Pin, 8-Bit Flash Microcontroller

PIC12F519
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 regis-
ter. A Reset sets the OPTION<7:0> bits.
Note: If the T0SC bit is set to ‘1’, it will override
the TRIS function on the T0CKI pin.
REGISTER 4-2: OPTION: OPTION REGISTER
W-1
W-1
W-1
W-1
W-1
W-1
RBWU
RBPU
T0CS
T0SE
PSA
PS2
bit 7
W-1
W-1
PS1
PS0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
RBWU: Enable Wake-up On Pin Change bit
1 = Disabled
0 = Enabled
RBPU: Enable Weak Pull-ups bit
1 = Disabled
0 = Enabled
T0CS: Timer0 Clock Source Select bit
1 = Transition on T0CKI pin
0 = Internal instruction cycle clock (CLKOUT)
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
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
© 2007 Microchip Technology Inc.
Preliminary
DS41319A-page 17