pic16c62b-20i-ss Microchip Technology Inc., pic16c62b-20i-ss Datasheet - Page 12

• Manufacturer Part Number: pic16c62b-20i-ss
• Description: 28-pin 8-bit Cmos Microcontrollers
• Manufacturer: Microchip Technology Inc.

PIC16C62B/72A
2.2.2.2
The OPTION_REG register is a readable and writable
register, which contains various control bits to configure
the TMR0 prescaler/WDT postscaler (single assign-
able register known as the prescaler), the External INT
Interrupt, TMR0 and the weak pull-ups on PORTB.
REGISTER 2-2:
DS35008B-page 12
bit7
bit 7:
bit 6:
bit 5:
bit 4:
bit 3:
bit 2-0: PS2:PS0: Prescaler Rate Select bits
R/W-1
RBPU
OPTION_REG REGISTER
RBPU: PORTB Pull-up Enable bit
1 = PORTB pull-ups are disabled
0 = PORTB pull-ups are enabled for all PORTB inputs
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
INTEDG
Bit Value
R/W-1
000
001
010
011
100
101
110
111
OPTION_REG REGISTER (ADDRESS 81h)
R/W-1
T0CS
TMR0 Rate
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
R/W-1
T0SE
WDT Rate
1 : 1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
R/W-1
PSA
Preliminary
R/W-1
PS2
R/W-1
Note:
PS1
To achieve a 1:1 prescaler assignment for
the TMR0 register, assign the prescaler to
the Watchdog Timer.
R/W-1
PS0
bit0
R = Readable bit
W = Writable bit
- n = Value at POR reset
1999 Microchip Technology Inc.