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PIC18F45K50 Datasheet(PDF) 1 Page - Microchip Technology |
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PIC18F45K50 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 44 page  2012 Microchip Technology Inc. DS41630B-page 1 PIC18(L)F2X/4XK50 1.0 DEVICE OVERVIEW This document includes the programming specifications for the following devices: 2.0 PROGRAMMING OVERVIEW The PIC18(L)F2X/4XK50 devices can be programmed using either the high-voltage In-Circuit Serial Programming™ (ICSP™) method or the low-voltage ICSP method. Both methods can be done with the device in the users’ system. The low-voltage ICSP method is slightly different than the high-voltage method and these differences are noted where applicable. This programming specification applies to the PIC18(L)F2X/4XK50 devices in all package types. 2.1 Hardware Requirements In High-Voltage ICSP mode, the PIC18(L)F2X/4XK50 devices require two programmable power supplies: one for VDD and one for MCLR/VPP/RE3. Both supplies should have a minimum resolution of 0.25V. Refer to Section 6.0 “AC/DC Characteristics Timing Requirements for Program/Verify Test Mode” for additional information. 2.1.1 LOW-VOLTAGE ICSP PROGRAMMING In Low-Voltage ICSP mode, the PIC18(L)F2X/4XK50 devices can be programmed using a single VDD source in the operating range. The MCLR/VPP/RE3 does not have to be brought to a different voltage, but can instead be left at the normal operating voltage. Refer to Section 2.7 “Entering and Exiting Low-Voltage ICSP Program/Verify Mode” for additional hardware parameters. 2.2 Dedicated ICSP/ICD Port (44-Pin TQFP Only) The PIC18F45K50/46K50 44-pin TQFP devices are designed to support an alternate programming input: the dedicated ICSP/ICD port. The primary purpose of this port is to provide an alternate In-Circuit Debugging (ICD) option and free the pins (RB6, RB7 and MCLR) that would normally be used for debugging the application. In conjunction with ICD capability, however, the dedicated ICSP/ICD port also provides an alternate port for ICSP. Setting the ICPRT Configuration bit enables the dedicated ICSP/ICD port. The dedicated ICSP/ICD port functions the same as the default ICSP/ICD port; however, alternate pins are used instead. Table 2-2 identifies the functionally equivalent pins for ICSP purposes: The dedicated ICSP/ICD port is an alternate port. Thus, ICSP is still available through the default port even though the ICPRT Configuration bit is set. • PIC18F24K50 • PIC18LF24K50 • PIC18F25K50 • PIC18LF25K50 • PIC18F26K50 • PIC18LF26K50 • PIC18F45K50 • PIC18LF45K50 • PIC18F46K50 • PIC18LF46K50 Note 1: The High-Voltage ICSP mode is always available, regardless of the state of the LVP bit, by applying VIHH to the MCLR/ VPP/RE3 pin. 2: While in Low-Voltage ICSP mode, MCLR is always enabled, regardless of the MCLRE bit, and the RE3 pin can no longer be used as a general purpose input. Note: The ICPRT Configuration bit can only be programmed through the default ICSP port. By default the ICPORT Configuration bit is enabled. When the ICPRT Configuration bit is cleared (dedicated ICSP/ICD port is disabled), the ICDPORTS pin should be tied to either VDD or VSS on 44 TQFP packages only. The ICPRT Configuration bit must be maintained clear for all 28-pin and 40-pin devices; otherwise, unexpected operation may occur. Flash Memory Programming Specification |
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