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PIC24FJ64GA Datasheet(PDF) 14 Page - Microchip Technology |
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PIC24FJ64GA Datasheet(HTML) 14 Page - Microchip Technology |
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14 / 52 page  PIC24FJXXXGA0XX DS39768D-page 14 © 2008 Microchip Technology Inc. 3.2.2 REGOUT SERIAL INSTRUCTION EXECUTION The REGOUT control code allows for data to be extracted from the device in ICSP mode. It is used to clock the contents of the VISI register, out of the device, over the PGDx pin. After the REGOUT control code is received, the CPU is held Idle for 8 cycles. After these 8 cycles, an additional 16 cycles are required to clock the data out (see Figure 3-3). The REGOUT code is unique because the PGDx pin is an input when the control code is transmitted to the device. However, after the control code is processed, the PGDx pin becomes an output as the VISI register is shifted out. FIGURE 3-3: REGOUT SERIAL EXECUTION Note 1: After the contents of VISI are shifted out, the PIC24FJXXXGA0XX device maintains PGDx as an output until the first rising edge of the next clock is received. 2: Data changes on the falling edge and latches on the rising edge of PGCx. For all data transmissions, the Least Significant bit (LSb) is transmitted first. 12 3 4 1 2 7 8 PGCx P4 PGDx PGDx = Input Execute Previous Instruction, CPU Held in Idle Shift Out VISI Register<15:0> P5 PGDx = Output 12 3 12 3 4 P4A 11 13 15 16 14 12 No Execution Takes Place, Fetch Next Control Code 0 00 0 0 PGDx = Input MSb 123 4 1 45 6 LSb 14 13 12 ... 11 10 0 Fetch REGOUT Control Code 0 |
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