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PIC17C43 Datasheet(PDF) 7 Page - Microchip Technology |
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PIC17C43 Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 16 page  © 1996 Microchip Technology Inc. DS30139I-page 7 EPROM Memory Programming Specification 4.0 CONFIGURATION WORD Configuration bits are mapped into program memory. Each bit is assigned one memory location. In erased condition a bit will read as '1'. To program a bit, the user needs to write to the memory address. The data is immaterial; the very act of writing will program the bit. The configuration word locations are shown in Table 4-3. The programmer should not program the reserved locations to avoid unpredictable results and to be compatible with future variations of the PIC17C4X. It is also mandatory that configuration locations are programmed in the strict order start- ing from the first location (0xFE00) and ending with the last (0xFE0F). Unpredictable results may occur if the sequence is violated. 4.1 Reading Configuration Word The PIC17CXX has seven configuration locations (see Table 4-1). These locations can be programmed (read as '0') or left unprogrammed (read as '1') to select var- ious device configurations. Any write to a configuration location, regardless of the data, will program that con- figuration bit. Reading any configuration location between 0xFE00 and 0xFE07 will place the low byte of the configuration word (see Table 4-2) into PAD<7:0> (PORTC). PAD<15:8> (PORTB) will be set to 0xFF. Reading a configuration location between 0xFE08 and 0xFE0F will place the high byte of the configuration word into PAD<7:0> (PORTC). PAD<15:8> (PORTB) will be set to 0xFF. TABLE 4-1: CONFIGURATION BIT PROGRAMMING LOCATIONS †This location does not exist on the PIC17C42. Bit Address FOSC0 0xFE00 FOSC1 0xFE01 WDTPS0 0xFE02 WDTPS1 0xFE03 PM0 0xFE04 PM1 0xFE06 PM2† 0xFE0F TABLE 4-2: READ MAPPING OF CONFIGURATION BITS —=Unused PM<2:0>, Processor Mode Select bits 111 = Microprocessor mode 110 = Microcontroller mode 101 = Extended Microcontroller mode 000 = Code protected microcontroller mode WDTPS<1:0>, WDT Prescaler Select bits. 11 = WDT enabled, postscaler = 0 10 = WDT enabled, postscaler = 256 01 = WDT enabled, postscaler = 64 00 = WDT disabled, 16-bit overflow timer FOSC<1:0>, Oscillator Select bits 11 = EC oscillator 10 = XT oscillator 01 = RC oscillator 00 = LF oscillator * This bit does not exist on PIC17C42. WDTPS1 FOSC1 FOSC0 WDTPS0 PM0 PM1 — — PM2* 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 —— — 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 —— — 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 — |
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