- 您现在的位置：买卖IC网 > Sheet目录3871 > PIC18F83J11T-I/PT (Microchip Technology)IC PIC MCU FLASH 4KX16 80TQFP
PIC18F85J11 FAMILY
DS39774D-page 104
2010 Microchip Technology Inc.
8.6.2
16-BIT WORD WRITE MODE
Figure 8-2 shows an example of 16-Bit Word Write
mode for PIC18F85J11 family devices. This mode is
used for word-wide memories which include some of
the EPROM and Flash-type memories. This mode
allows opcode fetches and table reads from all forms of
16-bit memory and table writes to any type of
word-wide external memories. This method makes a
distinction between TBLWT cycles to even or odd
addresses.
During a TBLWT cycle to an even address
(TBLPTR<0> = 0), the TABLAT data is transferred to a
holding latch and the external address data bus is
tri-stated for the data portion of the bus cycle. No write
signals are activated.
During
a
TBLWT
cycle
to
an
odd
address
(TBLPTR<0> = 1), the TABLAT data is presented on
the upper byte of the AD<15:0> bus. The contents of
the holding latch are presented on the lower byte of the
AD<15:0> bus.
The WRH signal is strobed for each write cycle; the
WRL pin is unused. The signal on the BA0 pin indicates
the LSb of the TBLPTR, but it is left unconnected.
Instead, the UB and LB signals are active to select both
bytes. The obvious limitation to this method is that the
table write must be done in pairs on a specific word
boundary to correctly write a word location.
FIGURE 8-2:
16-BIT WORD WRITE MODE EXAMPLE
AD<7:0>
PIC18F85J11
AD<15:8>
ALE
373
A<20:1>
373
OE
WRH
A<19:16>(1)
A<x:0>
D<15:0>
OE
WR(2)
CE
D<15:0>
JEDEC Word
EPROM Memory
Address Bus
Data Bus
Control Lines
Note 1:
The upper order address lines are used only for 20-bit address widths.
2:
This signal only applies to table writes. See Section 7.1 “Table Reads and Table Writes”.
CE
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
PIC16LF627-04/P
IC MCU FLASH 1KX14 COMP 18DIP
PIC18F86J55T-I/PT
IC PIC MCU FLASH 48KX16 80TQFP
PIC18F43K22-I/MV
MCU PIC 8KB FLASH 40QFN
PIC16C55A-04I/P
IC MCU OTP 512X12 28DIP
PIC18LF43K22-I/MV
MCU PIC 8KB FLASH 40UQFN
PIC16C622A-20I/P
IC MCU OTP 2KX14 COMP 18DIP
PIC18F84J11T-I/PT
IC PIC MCU FLASH 8KX16 80TQFP
PIC18F24K22-I/SP
IC PIC MCU 16KB FLASH 28SPDIP
相关代理商/技术参数
PIC18F83J90-I/PT
功能描述:8位微控制器 -MCU 8KB FL 1024b RAM 67I/O 8b Fam 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
PIC18F83J90T-I/PT
功能描述:8位微控制器 -MCU 8KB Flash 1024bytes-RAM 67I/O 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
PIC18F8410-E/PT
功能描述:8位微控制器 -MCU 16kBF 768RM 70I/O 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
PIC18F8410-I/PT
功能描述:8位微控制器 -MCU 16kBF 768RM 70I/O 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
PIC18F8410T-I/PT
功能描述:8位微控制器 -MCU 16kBF 768RM 70I/O 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
PIC18F8490-E/PT
功能描述:8位微控制器 -MCU 16kBF 768RM 66I/O 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
PIC18F8490-I/PT
功能描述:8位微控制器 -MCU 16kBF 768RM 66I/O 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
PIC18F8490-I/PT
制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 18F8490 TQFP80