PIC16HV785-I/SO View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16HV785-I/SO Datasheet PDF : 206 Pages
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PIC16F785/HV785
2.2.2.2 OPTION_REG Register
The Option register is a readable and writable register,
which contains various control bits to configure the
TMR0/WDT prescaler, the external RA2/INT interrupt,
the TMR0 and the weak pull-ups on PORTA.
Note:
To achieve a 1:1 prescaler assignment for
TMR0, assign the prescaler to the WDT by
setting PSA bit to ‘1’ in the OPTION Reg-
ister. See Section 5.4 “Prescaler”.
REGISTER 2-2: OPTION_REG: OPTION REGISTER
R/W-1
RAPU
bit 7
R/W-1
INTEDG
R/W-1
T0CS
R/W-1
T0SE
R/W-1
PSA
R/W-1
PS2
R/W-1
PS1
R/W-1
PS0
bit 0
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
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
RAPU: PORTA Pull-up Enable bit
1 = PORTA pull-ups are disabled
0 = PORTA pull-ups are enabled by individual port latch values in WPUA register
INTEDG: Interrupt Edge Select bit
1 = Interrupt on rising edge of RA2/AN2/T0CKI/INT/C1OUT pin
0 = Interrupt on falling edge of RA2/AN2/T0CKI/INT/C1OUT pin
T0CS: TMR0 Clock Source Select bit
1 = Transition on RA2/AN2/T0CKI/INT/C1OUT pin
0 = Internal instruction cycle clock (CLKOUT)
T0SE: TMR0 Source Edge Select bit
1 = Increment on high-to-low transition on RA2/AN2/T0CKI/INT/C1OUT pin
0 = Increment on low-to-high transition on RA2/AN2/T0CKI/INT/C1OUT pin
PSA: Prescaler Assignment bit
1 = Prescaler is assigned to the WDT
0 = Prescaler is assigned to the Timer0 module
PS<2:0>: Prescaler Rate Select bits
Bit Value TMR0 Rate WDT Rate(1)
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
Note 1: A dedicated 16-bit WDT postscaler is available for the PIC16F785/HV785.
See Section 15.5 “Watchdog Timer (WDT)” for more information.
DS41249E-page 16
© 2008 Microchip Technology Inc.
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