PIC16F684-ISL

Manufacturer Part NumberPIC16F684-ISL
ManufacturerMicrochip Technology Inc.
PIC16F684-ISL datasheets
 


Specifications of PIC16F684-ISL

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PIC16F684
2.2.2.2
Option Register
The Option register is a readable and writable register,
which contains various control bits to configure:
• TMR0/WDT prescaler
• External RA2/INT interrupt
• TMR0
• Weak pull-ups on PORTA
REGISTER 2-2:
OPTION_REG – OPTION REGISTER (ADDRESS: 81h)
R/W-1
R/W-1
RAPU
INTEDG
bit 7
bit 7
RAPU: PORTA Pull-up Enable bit
1 = PORTA pull-ups are disabled
0 = PORTA pull-ups are enabled by individual port latch values
bit 6
INTEDG: Interrupt Edge Select bit
1 = Interrupt on rising edge of RA2/INT pin
0 = Interrupt on falling edge of RA2/INT pin
bit 5
T0CS: TMR0 Clock Source Select bit
1 = Transition on RA2/T0CKI pin
0 = Internal instruction cycle clock (CLKOUT)
bit 4
T0SE: TMR0 Source Edge Select bit
1 = Increment on high-to-low transition on RA2/T0CKI pin
0 = Increment on low-to-high transition on RA2/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
BIT VALUE
000
001
010
011
100
101
110
111
Legend:
R = Readable bit
-n = Value at POR
DS41202C-page 12
Note:
To achieve a 1:1 prescaler assignment for
TMR0, assign the prescaler to the WDT by
setting PSA bit to ‘1’ (OPTION_REG<3>).
See Section 5.4 “Prescaler”.
R/W-1
R/W-1
R/W-1
T0CS
T0SE
PSA
TMR0 RATE
WDT RATE
1 : 2
1 : 1
1 : 4
1 : 2
1 : 8
1 : 4
1 : 16
1 : 8
1 : 32
1 : 16
1 : 64
1 : 32
1 : 128
1 : 64
1 : 256
1 : 128
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘1’ = Bit is set
‘0’ = Bit is cleared
Preliminary
R/W-1
R/W-1
R/W-1
PS2
PS1
PS0
bit 0
x = Bit is unknown
 2004 Microchip Technology Inc.