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PIC16C505-04I/JW Datasheet(PDF) 15 Page - Microchip Technology |
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PIC16C505-04I/JW Datasheet(HTML) 15 Page - Microchip Technology |
15 / 80 page © 1998 Microchip Technology Inc. Preliminary DS40192A-page 15 PIC16C505 4.4 OPTION Register The OPTION register is a 8-bit wide, write-only register which contains various control bits to configure the Timer0/WDT prescaler and Timer0. By executing the OPTION instruction, the contents of the W register will be transferred to the OPTION register. A RESET sets the OPTION<7:0> bits. Note: If TRIS bit is set to ‘0’, the wake-up on change and pull-up functions are disabled for that pin; i.e., note that TRIS overrides OPTION control of RBPU and RBWU. FIGURE 4-4: OPTION REGISTER W-1 W-1 W-1 W-1 W-1 W-1 W-1 W-1 RBWU RBPU T0CS T0SE PSA PS2 PS1 PS0 W = Writable bit U = Unimplemented bit - n = Value at POR reset Reference Table 4-1 for other resets. bit7 6 5 4 3 2 1 bit0 bit 7: RBWU: Enable wake-up on pin change (RB0, RB1, RB3, RB4) 1 = Disabled 0 = Enabled bit 6: RBPU: Enable weak pull-ups (RB0, RB1, RB3, RB4) 1 = Disabled 0 = Enabled bit 5: T0CS: Timer0 clock source select bit 1 = Transition on T0CKI pin 0 = Transition on internal instruction cycle clock, Fosc/4 bit 4: T0SE: Timer0 source edge select bit 1 = Increment on high to low transition on the T0CKI pin 0 = Increment on low to high transition on the T0CKI pin bit 3: PSA: Prescaler assignment bit 1 = Prescaler assigned to the WDT 0 = Prescaler assigned to Timer0 bit 2-0: PS2:PS0: Prescaler rate select bits 000 001 010 011 100 101 110 111 1 : 2 1 : 4 1 : 8 1 : 16 1 : 32 1 : 64 1 : 128 1 : 256 1 : 1 1 : 2 1 : 4 1 : 8 1 : 16 1 : 32 1 : 64 1 : 128 Bit Value Timer0 Rate WDT Rate |
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