PIC16LC781T-ISS Просмотр технического описания (PDF) - Microchip Technology
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PIC16LC781T-ISS
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PIC16LC781T-ISS Datasheet PDF : 188 Pages
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PIC16C781/782
2.4 OPTION_REG Register
The OPTION_REG register is a readable and writable
register which contains various control bits to configure:
• TMR0 prescaler/WDT postscaler (single assign-
able register known also as the prescaler)
• External INT interrupt
• TMR0
• Weak pull-ups on PORTB
Note:
To achieve a 1:1 prescaler assignment for
the TMR0 register, assign the prescaler to
the Watchdog Timer.
REGISTER 2-2:
OPTION REGISTER (OPTION_REG: 81h, 181h)
R/W-1
RBPU
bit7
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
bit0
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
RBPU: PORTB Pull-up Enable bit(1)
1 = PORTB weak pull-ups are disabled
0 = PORTB weak pull-ups are enabled by the WPUB register
INTEDG: Interrupt Edge Select bit
1 = Interrupt on rising edge of RB0/INT pin
0 = Interrupt on falling edge of RB0/INT pin
T0CS: TMR0 Clock Source Select bit
1 = Transition on RA4/T0CKI pin
0 = Internal instruction cycle clock (FOSC/4)
T0SE: TMR0 Source Edge Select bit
1 = Increment on high-to-low transition on RA4/T0CKI pin
0 = Increment on low-to-high transition on RA4/T0CKI 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
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: Individual weak pull-ups on RB pins can be enabled/disabled from the weak pull-up
PORTB register (WPUB).
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
DS41171B-page 18
Preliminary
2001-2013 Microchip Technology Inc.
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