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参数资料
| 型号： | PIC18F44K20-E/P |
| 厂商： | Microchip Technology |
| 文件页数： | 28/42页 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU FLASH 8KX16 40-DIP |
| 产品培训模块： | XLP Deep Sleep Mode |
| 标准包装： | 10 |
| 系列： | PIC® XLP™ 18F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 48MHz |
| 连通性： | I²C，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，HLVD，POR，PWM，WDT |
| 输入/输出数： | 35 |
| 程序存储器容量： | 16KB（8K x 16） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 256 x 8 |
| RAM 容量： | 768 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 1.8 V ~ 3.6 V |
| 数据转换器： | A/D 14x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 包装： | 管件 |
| 产品目录页面： | 643 (CN2011-ZH PDF) |
| 配用： | AC164112-ND - VOLTAGE LIMITER MPLAB ICD2 VPP DM164124-ND - KIT STARTER FOR PIC18F4XK20 |
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PIC18F2XK20/4XK20
DS41297F-page 34
Advance Information
2009 Microchip Technology Inc.
5.3
Single-Supply ICSP Programming
The LVP bit in Configuration register, CONFIG4L,
enables Single-Supply (Low-Voltage) ICSP Program-
ming. The LVP bit defaults to a ‘1’ (enabled) from the
factory.
If Single-Supply Programming mode is not used, the
LVP bit can be programmed to a ‘0’ and RB5/PGM
becomes a digital I/O pin. However, the LVP bit may
only be programmed by entering the High-Voltage
ICSP mode, where MCLR/VPP/RE3 is raised to VIHH.
Once the LVP bit is programmed to a ‘0’, only the
High-Voltage ICSP mode is available and only the
High-Voltage ICSP mode can be used to program the
device.
5.4
Embedding Configuration Word
Information in the HEX File
To allow portability of code, a PIC18F2XK20/4XK20
programmer is required to read the Configuration Word
locations from the hex file. If Configuration Word infor-
mation is not present in the hex file, then a simple warn-
ing message should be issued. Similarly, while saving
a hex file, all Configuration Word information must be
included. An option to not include the Configuration
Word information may be provided. When embedding
Configuration Word information in the hex file, it should
start at address 300000h.
Microchip Technology Inc. feels strongly that this
feature is important for the benefit of the end customer.
5.5
Embedding Data EEPROM
Information In the HEX File
To allow portability of code, a PIC18F2XK20/4XK20
programmer is required to read the data EEPROM
information from the hex file. If data EEPROM informa-
tion is not present, a simple warning message should
be issued. Similarly, when saving a hex file, all data
EEPROM information must be included. An option to
not include the data EEPROM information may be pro-
vided. When embedding data EEPROM information in
the hex file, it should start at address F00000h.
Microchip Technology Inc. believes that this feature is
important for the benefit of the end customer.
5.6
Checksum Computation
The checksum is calculated by summing the following:
The contents of all code memory locations
The Configuration Word, appropriately masked
ID locations (Only if any portion of program
memory is code-protected)
The Least Significant 16 bits of this sum are the
checksum.
Code protection limits access to program memory by
both external programmer (code-protect) and code
execution (table read protect). The ID locations, when
included in a code protected checksum, contain the
checksum of an unprotected part. The unprotected
checksum is distributed: one nibble per ID location.
Each nibble is right justified.
Table 5-4 describes how to calculate the checksum for
each device.
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, the
RB5 pin can no longer be used as a
general purpose I/O.
Note:
The checksum calculation differs depend-
ing on the code-protect setting. Since the
code memory locations read out differently
depending on the code-protect setting, the
table describes how to manipulate the
actual code memory values to simulate
the values that would be read from a
protected device. When calculating a
checksum by reading a device, the entire
code memory can simply be read and
summed. The Configuration Word and ID
locations can always be read.
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| PIC18F44K20-I/ML | 功能描述:8位微控制器 -MCU 16KB Flash 768B RAM 36 I/O 8B RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC18F44K20-I/MV | 功能描述:8位微控制器 -MCU 16KB FL 768b-RAM 8b Familynanowatt XLP RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC18F44K20-I/P | 功能描述:8位微控制器 -MCU 16KB Flash 768B RAM 36 I/O 8B RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC18F44K20-I/PT | 功能描述:8位微控制器 -MCU 16KB Flash 768B RAM 36 I/O 8B RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC18F44K20T-I/ML | 功能描述:8位微控制器 -MCU 16KB Flash 768B RAM 36 I/O 8B RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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