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PIC24FJ32GA004 Datasheet(PDF) 3 Page - Microchip Technology |
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PIC24FJ32GA004 Datasheet(HTML) 3 Page - Microchip Technology |
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3 / 52 page  © 2008 Microchip Technology Inc. DS39768D-page 3 PIC24FJXXXGA0XX 2.2 Program Memory Write/Erase Requirements The Flash program memory on the PIC24FJXXXGA0XX devices has a specific write/erase requirement that must be adhered to for proper device operation. The rule is that any given word in memory must not be written more than twice before erasing the page in which it is located. Thus, the easiest way to conform to this rule is to write all the data in a programming block within one write cycle. The programming methods specified in this specification comply with this requirement. 2.3 Pin Diagrams The pin diagrams for the PIC24FJXXXGA0XX family are shown in the following figures. The pins that are required for programming are listed in Table 2-1 and are shown in bold letters in the figures. Refer to the appropriate device data sheet for complete pin descriptions. TABLE 2-1: PIN DESCRIPTIONS (DURING PROGRAMMING) Note: Writing to a location multiple times without erasing is not recommended. Pin Name During Programming Pin Name Pin Type Pin Description MCLR MCLR P Programming Enable ENVREG ENVREG I Enable for On-Chip Voltage Regulator DISVREG(1) DISVREG I Disable for On-Chip Voltage Regulator VDD and AVDD(2) VDD P Power Supply VSS and AVSS(2) VSS PGround VDDCORE VDDCORE P Regulated Power Supply for Core PGC1 PGC I Primary Programming Pin Pair: Serial Clock PGD1 PGD I/O Primary Programming Pin Pair: Serial Data PGC2 PGC I Secondary Programming Pin Pair: Serial Clock PGD2 PGD I/O Secondary Programming Pin Pair: Serial Data Legend: I = Input, O = Output, P = Power Note 1: Applies to 28 and 44-pin devices only. 2: All power supply and ground pins must be connected, including analog supplies (AVDD) and ground (AVSS). |
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