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PIC12F683 Datasheet(PDF) 94 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 94 Page - Microchip Technology |
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94 / 148 page  PIC12F683 DS41211B-page 92 Preliminary 2004 Microchip Technology Inc. FIGURE 12-10: WAKE-UP FROM SLEEP THROUGH INTERRUPT 12.8 Code Protection If the code protection bit(s) have not been programmed, the on-chip program memory can be read out using ICSP for verification purposes. 12.9 ID Locations Four memory locations (2000h-2003h) are designated as ID locations where the user can store checksum or other code identification numbers. These locations are not accessible during normal execution but are readable and writable during Program/Verify mode. Only the Least Significant 7 bits of the ID locations are used. 12.10 In-Circuit Serial Programming The PIC12F683 microcontrollers can be serially programmed while in the end application circuit. This is simply done with two lines for clock and data and three other lines for: •Power •Ground • Programming Voltage This allows customers to manufacture boards with unprogrammed devices and then program the micro- controller just before shipping the product. This also allows the most recent firmware or a custom firmware to be programmed. The device is placed into a Program/Verify mode by holding the GP0 and GP1 pins low, while raising the MCLR (VPP) pin from VIL to VIHH. See the “PIC12F6XX/ 16F6XX Memory Programming Specification” (DS41204) for more information. GP0 becomes the programming data and GP1 becomes the program- ming clock. Both GP0 and GP1 are Schmitt Trigger inputs in this mode. After Reset, to place the device into Program/Verify mode, the Program Counter (PC) is at location 00h. A 6-bit command is then supplied to the device. Depending on the command, 14 bits of program data are then supplied to or from the device, depending on whether the command was a load or a read. For complete details of serial programming, please refer to the “PIC12F6XX/16F6XX Memory Programming Specification” (DS41204). A typical In-Circuit Serial Programming connection is shown in Figure 12-11. Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 OSC1 CLKOUT(4) INT pin INTF flag (INTCON<1>) GIE bit (INTCON<7>) Instruction Flow PC Instruction Fetched Instruction Executed PC PC + 1 PC + 2 Inst(PC) = Sleep Inst(PC – 1) Inst(PC + 1) Sleep Processor in Sleep Interrupt Latency(3) Inst(PC + 2) Inst(PC + 1) Inst(0004h) Inst(0005h) Inst(0004h) Dummy Cycle PC + 2 0004h 0005h Dummy Cycle TOST(2) PC + 2 Note 1: XT, HS or LP Oscillator mode assumed. 2: TOST = 1024 TOSC (drawing not to scale). This delay does not apply to EC and RCIO Oscillator modes. 3: GIE = 1 assumed. In this case after wake-up, the processor jumps to 0004h. If GIE = 0, execution will continue in-line. 4: CLKOUT is not available in XT, HS, LP or EC Oscillator modes, but shown here for timing reference. Note: The entire data EEPROM and Flash program memory will be erased when the code protection is turned off. See the PIC12F6XX/16F6XX Memory Program- ming Specification (DS41204) for more information. |
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