PIC18F2520-I/ML【PDF 80/151 页】IC PIC MCU FLASH 16KX16 28QFN

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录3832

76页 77页 78页 79页 [80页]81页 82页 83页 84页

2011-2012 Microchip Technology Inc.

Preliminary

DS41579C-page 347

PIC16(L)F1782/3

28.0 IN-CIRCUIT SERIAL

PROGRAMMING (ICSP)

ICSP programming allows customers to manufacture

circuit boards with unprogrammed devices. Programming

can be done after the assembly process allowing the

device to be programmed with the most recent firmware

or a custom firmware. Five pins are needed for ICSP

programming:

ICSPCLK

ICSPDAT

MCLR/VPP

VDD

VSS

In Program/Verify mode the program memory, user IDs

and the Configuration Words are programmed through

serial communications. The ICSPDAT pin is a

bidirectional I/O used for transferring the serial data

and the ICSPCLK pin is the clock input. For more

information on ICSP refer to the “PIC16(L)F178X

Memory Programming Specification”

(DS41457).

28.1

High-Voltage Programming Entry

Mode

The device is placed into High-Voltage Programming

Entry mode by holding the ICSPCLK and ICSPDAT

pins low then raising the voltage on MCLR/VPP to VIHH.

28.2

Low-Voltage Programming Entry

Mode

The Low-Voltage Programming Entry mode allows the

PIC Flash MCUs to be programmed using VDD only,

without high voltage. When the LVP bit of Configuration

Words is set to ‘1’, the low-voltage ICSP programming

entry is enabled. To disable the Low-Voltage ICSP

mode, the LVP bit must be programmed to ‘0’.

Entry into the Low-Voltage Programming Entry mode

requires the following steps:

MCLR is brought to VIL.

A 32-bit key sequence is presented on

ICSPDAT, while clocking ICSPCLK.

Once the key sequence is complete, MCLR must be

held at VIL for as long as Program/Verify mode is to be

maintained.

If low-voltage programming is enabled (LVP = 1), the

MCLR Reset function is automatically enabled and

cannot be disabled. See Section 5.5 “MCLR” for more

information.

The LVP bit can only be reprogrammed to ‘0’ by using

the High-Voltage Programming mode.

28.3

Common Programming Interfaces

Connection to a target device is typically done through

an ICSP header. A commonly found connector on

development tools is the RJ-11 in the 6P6C (6 pin, 6

connector) configuration. See Figure 28-1.

FIGURE 28-1:

ICD RJ-11 STYLE

CONNECTOR INTERFACE

Another connector often found in use with the PICkit

programmers is a standard 6-pin header with 0.1 inch

spacing. Refer to Figure 28-2.

Target

Bottom Side

PC Board

VPP/MCLR

VSS

ICSPCLK

VDD

ICSPDAT

Pin Description*

1 = VPP/MCLR

2 = VDD Target

3 = VSS (ground)

4 = ICSPDAT

5 = ICSPCLK

6 = No Connect

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式