PIC10F200/202/204/206
4.5
OPTION Register
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 GPPU and GPWU).
If the T0CS bit is set to ‘1’, it will override
the TRIS function on the T0CKI pin.
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:
REGISTER 4-2:
W-1
GPWU
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
OPTION REGISTER
W-1
GPPU
W-1
T0CS
W-1
T0SE
W-1
PSA
W-1
PS2
W-1
PS1
W-1
PS0
bit 0
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
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
T0CS:
Timer0 Clock Source Select bit
1
= Transition on T0CKI pin (overrides TRIS on the T0CKI pin)
0
= Transition on internal instruction cycle clock, F
OSC
/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
000
001
010
011
100
101
110
111
Timer0 Rate WDT Rate
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 6
bit 5
bit 4
bit 3
bit 2-0
.
DS41239D-page 20
©
2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
