PIC16C926 Microchip Technology Inc., PIC16C926 Datasheet - Page 22
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PIC16C926
Manufacturer Part Number
PIC16C926
Description
64/68-pin Cmos Microcontrollers With Lcd Driver
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16C926.pdf
(182 pages)
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PIC16C925/926
2.3.2
The OPTION register is a readable and writable regis-
ter, which contains various control bits to configure the
TMR0/WDT prescaler, the external RB0/INT pin inter-
rupt, TMR0, and the weak pull-ups on PORTB.
REGISTER 2-2:
DS39544A-page 20
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
OPTION REGISTER
OPTION REGISTER (ADDRESS 81h, 181h)
Bit Value TMR0 Rate WDT Rate
bit 7
RBPU: PORTB Pull-up Enable bit
1 = PORTB pull-ups are disabled
0 = PORTB pull-ups are enabled by individual port latch values
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 (CLKOUT)
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
PS2:PS0: Prescaler Rate Select bits
Legend:
R = Readable bit
- n = Value at POR
R/W-1
RBPU
000
001
010
011
100
101
110
111
INTEDG
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
R/W-1
R/W-1
1 : 1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
T0CS
Preliminary
W = Writable bit
’1’ = Bit is set
R/W-1
T0SE
Note:
R/W-1
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
PSA
To achieve a 1:1 prescaler assignment for
the TMR0 register, assign the prescaler to
the Watchdog Timer.
R/W-1
PS2
2001 Microchip Technology Inc.
x = Bit is unknown
R/W-1
PS1
R/W-1
PS0
bit 0