Datasheet > PIC184XK50

PIC184XK50

更新时间： 2024-11-10 12:01:55

品牌	Logo	应用领域
美国微芯 - MICROCHIP		闪存
页数	文件大小	规格书
44页	593K
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Flash Memory Programming Specification

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PIC184XK50 数据手册

PIC18(L)F2X/4XK50

Flash Memory Programming Specification

1.0

DEVICE OVERVIEW

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.

This

document

includes

the

programming

specifications for the following devices:

• PIC18F24K50

• PIC18F25K50

• PIC18F26K50

• PIC18F45K50

• PIC18F46K50

• PIC18LF24K50

• PIC18LF25K50

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.

• PIC18LF26K50

• PIC18LF45K50

• PIC18LF46K50

2.0

PROGRAMMING OVERVIEW

2.2

Dedicated ICSP/ICD Port (44-Pin

TQFP Only)

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.

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.

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

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.

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.

 2012 Microchip Technology Inc.

DS41630B-page 1

12 3 4 5 6 7...44

中文翻译

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