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DVA18PQ800 Datasheet(PDF) 3 Page - Microchip Technology |
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DVA18PQ800 Datasheet(HTML) 3 Page - Microchip Technology |
3 / 18 page © 2006 Microchip Technology Inc. DS51140M-page 3 Processor Module and Device Adapter Specification 4.1.1 EMULATOR PROCESSOR POWER SUPPLIED BY EMULATOR SYSTEM If the emulator system is selected to power the emula- tor processor in the processor module, the emulator system can be operated without being connected to a target application. If the system is being connected to a target application, the power to the pod should be applied before applying power to the target application. The target application system’s VCC will experience a small current load (10 mA typical) when the emulator system is connected via a device adapter. This is because the target system must always power the clock chip in the processor module. 4.1.2 EMULATOR PROCESSOR POWER SUPPLIED BY TARGET APPLICATION SYSTEM When the MPLAB IDE software is brought up, the emulator system is first initialized with the emulator system powering the emulator processor. The “Processor Power Supplied by Target Board” option may then be selected using the Power tab of the Settings dialog (Debugger>Settings) to power the processor module from the target board. When operating from external power, the processor module will typically represent a current load equivalent to the device being emulated (according to its data sheet) plus approximately 100 mA. Keep in mind that the target application will affect the overall current load of the processor module, dependent upon the load placed upon the processor I/O. When the processor power is supplied by the target application system, an external clock (from the target board) may also be provided. MPLAB IDE will not allow use of an external clock without the use of external power. 4.1.3 OPERATING VOLTAGE OF 4.6 TO 5.5 VOLTS If the target application system’s operating voltage is between 4.55V (±120 mV) and 5.5V, the processor module will consider this a STANDARD VOLTAGE condition. In this mode, the processor can run to its highest rated speed (as indicated in its data sheet). The recommended power-up sequence is: 1. Apply power to the PC host. 2. Apply power to the emulator pod and processor module assembly. 3. Invoke MPLAB IDE. 4. Select Debugger > Settings and click the Power tab. Configure system for “Processor Power Supplied by Target Board”. 5. At the error message, apply power to the target application circuit. Then acknowledge the error. 6. Issue a System Reset (from the debugger menu) before proceeding. 4.1.4 OPERATING VOLTAGE OF 2.0 TO 4.6 VOLTS If the target application system’s operating voltage is between 2.0V and 4.55V (±120 mV), the processor module will consider this a LOW VOLTAGE condition. In this mode, the processor is limited to its rated speed at a given voltage level (as indicated in its data sheet). To minimize the amount of reverse current that the target system is exposed to, the recommended power-up sequence is: 1. Apply power to the PC host. 2. Apply power to the emulator pod and processor module assembly. 3. Invoke MPLAB IDE. 4. Select Debugger > Settings and click the Power tab. Configure system for “Processor Power Supplied by Target Board”. 5. At the error message, apply power to the target application circuit. Then acknowledge the error. 6. Issue a System Reset (from the debugger menu) before proceeding. 7. Select Debugger > Settings and click the Power tab. Verify that the dialog says “Low Voltage Enabled.” Click Cancel to close the dialog. 4.2 Operating Frequency The processor modules will support the maximum frequency (except where noted in Section 3.0 “Emulator-Related Issues”) of the device under emulation. The maximum frequency of a PICmicro MCU device is significantly lower when the operating voltage is less than 4.5V. The processor modules will support a minimum frequency of 32 kHz. When operating at low frequencies, response to the screen may be slow. 4.3 Clock Options MPLAB ICE 2000 allows internal and external clocking. When set to internal, the clock is supplied from the internal programmable clock, located in the emulator pod. When set to external, the oscillator on the target application system will be utilized. 4.3.1 CLOCK SOURCE FROM EMULATOR Refer to the MPLAB ICE 2000 on-line help file in MPLAB IDE (Help>Topics) or the “MPLAB® ICE 2000 In-Circuit Emulator User’s Guide” (DS51488), “Using the On-Board Clock”, for configuring MPLAB IDE to supply the clock source. |
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