Microchip Technology MCP1630DM-DDBS1 Ficha De Dados
PIC12F683
DS41211D-page 12
©
2007 Microchip Technology Inc.
2.2.2.2
OPTION Register
The OPTION register is a readable and writable
register, which contains various control bits to
configure:
register, which contains various control bits to
configure:
• TMR0/WDT prescaler
• External GP2/INT interrupt
• TMR0
• Weak pull-ups on GPIO
Note:
To achieve a 1:1 prescaler assignment for
Timer0, assign the prescaler to the WDT
by setting PSA bit of the OPTION register
to ‘
Timer0, assign the prescaler to the WDT
by setting PSA bit of the OPTION register
to ‘
1
REGISTER 2-2:
OPTION_REG: OPTION REGISTER
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
GPPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
GPPU: GPIO Pull-up Enable bit
1
= GPIO pull-ups are disabled
0
= GPIO pull-ups are enabled by individual PORT latch values in WPU register
bit 6
INTEDG: Interrupt Edge Select bit
1
= Interrupt on rising edge of INT pin
0
= Interrupt on falling edge of INT pin
bit 5
T0CS: Timer0 Clock Source Select bit
1
= Transition on T0CKI pin
0
= Internal instruction cycle clock (F
OSC
/4)
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 is assigned to the WDT
0
= Prescaler is assigned to the Timer0 module
bit 2-0
PS<2:0>: Prescaler Rate Select bits
Note 1:
A dedicated 16-bit WDT postscaler is available. See Section 12.6 “Watchdog Timer (WDT)” for more
information.
information.
000
001
010
011
100
101
110
111
001
010
011
100
101
110
111
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
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
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
BIT VALUE
TIMER0 RATE WDT RATE