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PIC16F72 Datasheet(PDF) 61 Page - Microchip Technology |
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PIC16F72 Datasheet(HTML) 61 Page - Microchip Technology |
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61 / 136 page  2002 Microchip Technology Inc. DS39597B-page 59 PIC16F72 11.0 SPECIAL FEATURES OF THE CPU These devices have a host of features intended to max- imize system reliability, minimize cost through elimina- tion of external components, provide power saving Operating modes and offer code protection: • Oscillator Selection • RESET - Power-on Reset (POR) - Power-up Timer (PWRT) - Oscillator Start-up Timer (OST) - Brown-out Reset (BOR) • Interrupts • Watchdog Timer (WDT) • SLEEP • Code Protection • ID Locations • In-Circuit Serial Programming These devices have a Watchdog Timer, which can be enabled or disabled using a configuration bit. It runs off its own RC oscillator for added reliability. There are two timers that offer necessary delays on power-up. One is the Oscillator Start-up Timer (OST), intended to keep the chip in RESET until the crystal oscillator is stable. The other is the Power-up Timer (PWRT), which provides a fixed delay of 72 ms (nomi- nal) on power-up only. It is designed to keep the part in RESET while the power supply stabilizes, and is enabled or disabled using a configuration bit. With these two timers on-chip, most applications need no external RESET circuitry. SLEEP mode is designed to offer a very low current Power-down mode. The user can wake-up from SLEEP through external RESET, Watchdog Timer Wake-up, or through an interrupt. Several oscillator options are also made available to allow the part to fit the application. The RC oscillator option saves system cost while the LP crystal option saves power. Configuration bits are used to select the desired oscillator mode. Additional information on special features is available in the PICmicro™ Mid-Range Reference Manual (DS33023). 11.1 Configuration Bits The configuration bits can be programmed (read as ‘0’), or left unprogrammed (read as ‘1’), to select vari- ous device configurations. These bits are mapped in program memory location 2007h. The user will note that address 2007h is beyond the user program memory space, which can be accessed only during programming. |
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Similar Description - PIC16F72 |
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