DS87C520-QCL+T&R (Maxim) PDF资料下载 Datasheet(3/43 页)

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参数资料

型号：	DS87C520-QCL+T&R
厂商：	Maxim Integrated Products
文件页数：	3/43页
文件大小：	0K
描述：	IC MCU EPROM/ROM 33MHZ HS 44PLCC
产品培训模块：	Lead (SnPb) Finish for COTS Obsolescence Mitigation Program
标准包装：	500
系列：	87C
核心处理器：	8051
芯体尺寸：	8-位
速度：	33MHz
连通性：	EBI/EMI，SIO，UART/USART
外围设备：	电源故障复位，WDT
输入/输出数：	32
程序存储器容量：	16KB（16K x 8）
程序存储器类型：	OTP
RAM 容量：	1K x 8
电压 - 电源 (Vcc/Vdd)：	4.5 V ~ 5.5 V
振荡器型：	外部
工作温度：	0°C ~ 70°C
封装/外壳：	44-LCC（J 形引线）
包装：	带卷 (TR)

DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers

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16kB internal program space. If software reconfigures the ROMSIZE register to 4kB (0000h–0FFFh) in

the current state, the device will immediately jump to external program execution because program code

from 4kB to 16kB (1000h–3FFFh) is no longer located on-chip. This could result in code misalignment

and execution of an invalid instruction. The recommended method is to modify the ROMSIZE register

from a location in memory that will be internal (or external) both before and after the operation. In the

above example, the instruction which modifies the ROMSIZE register should be located below the 4kB

(1000h) boundary, so that it will be unaffected by the memory modification. The same precaution should

be applied if the internal program memory size is modified while executing from external program

memory.

Off-chip memory is accessed using the multiplexed address/data bus on P0 and the MSB address on P2.

While serving as a memory bus, these pins are not I/O ports. This convention follows the standard 8051

method of expanding on-chip memory. Off-chip ROM access also occurs if the

EA pin is a logic 0. EA

overrides all bit settings. The

PSEN signal goes active (low) to serve as a chip enable or output enable

when Ports 0 and 2 fetch from external ROM.

Figure 2. ROM Memory Map

DATA MEMORY ACCESS

Unlike many 8051 derivatives, the DS87C520/DS83C520 contain on-chip data memory. They also

contain the standard 256 bytes of RAM accessed by direct instructions. These areas are separate. The

MOVX instruction accesses the on-chip data memory. Although physically on-chip, software treats this

area as though it was located off-chip. The 1kB of SRAM is between address 0000h and 03FFh.

Access to the on-chip data RAM is optional under software control. When enabled by software, the data

SRAM is between 0000h and 03FFh. Any MOVX instruction that uses this area will go to the on-chip

RAM while enabled. MOVX addresses greater than 03FFh automatically go to external memory through

Ports 0 and 2.

ROM SIZE IGNORED

ROM SIZE ADJUSTABLE

DEFAULT = 16kB

相关代理商/技术参数	参数描述
DS87C520QNL	制造商:Other 功能描述:EPROM/ROM High-Speed Micro
DS87C520-QNL	功能描述:8位微控制器 -MCU EPROM/ROM High-Speed 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
DS87C520-QNL/T&R	制造商:Maxim Integrated Products 功能描述:MICRO OTP HISPD 44PLCC 33MHZ IND TR - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU EPROM/ROM 33MH IND 44PLCC
DS87C520-QNL/T&R	功能描述:8位微控制器 -MCU EPROM/ROM High-Speed 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
DS87C520-QNL+	功能描述:8位微控制器 -MCU EPROM/ROM High-Speed 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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