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PIC17CXX Datasheet(PDF) 3 Page - Microchip Technology |
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PIC17CXX Datasheet(HTML) 3 Page - Microchip Technology |
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3 / 16 page  © 1996 Microchip Technology Inc. DS30139I-page 3 EPROM Memory Programming Specification 2.1.1 LOADING NEW ADDRESS The program allows new address to be loaded right out of reset. A 16-bit address is presented on ports RB (high byte) and RC (low byte) and the RA1 is pulsed (0 → 1, then 1 → 0). The address is latched on the ris- ing edge of RA1. See timing diagrams for details. After loading an address, the program automatically goes into a “verify cycle”. To load a new address at any time, the PIC17C4X must be reset and the programming mode re-entered. 2.1.2 VERIFY (OR READ) MODE “Verify mode” can be entered from “Load address” mode, “program mode” or “verify mode”. In verify mode pulsing RA1 will turn on PORTS RB and RC output drivers and output the 16-bit value from the current location. Pulsing RA1 again will increment location count and be ready for the next verify cycle. Pulsing RA0 will begin a program cycle. 2.1.3 PROGRAM CYCLE “Program cycle” is entered from “verify cycle” or pro- gram cycle” itself. After a verify, pulsing RA0 will begin a program cycle. 16-bit data must be presented on PORTS RB (high byte) and RC (low byte) before RA0 is raised. The data is sampled 3 TCY cycles after the rising edge of RA0. Programming continues for the duration of RA0 pulse. At the end of programming the user can choose one of three different routes. If RA1 is kept low and RA0 is pulsed again, the same location will be programmed again. This is useful for applying over programming pulses. If RA1 is raised before RA0 falling edge, then a verify cycle is started without address increment. Rais- ing RA1 after RA0 goes low will increment address and begin verify cycle on the next address. FIGURE 2-2: PIC17C4X PROGRAM MEMORY MAP On chip Program EPROM Configuration Word FOSC0 FOSC1 WDTPS0 WDTPS1 PM0 PM1 PM2* Reserved Reserved Reserved FE00 FE01 FE02 FE03 FE04 FE05 FE06 FE07 FE08 FE09 FE0F Reserved 0000 07FF FE00 FE0F FFFF *This location does not exist for PIC17C42 |
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