参数资料
型号: 71M6513-IGT/F
厂商: MAXIM INTEGRATED PRODUCTS INC
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PQFP100
封装: LEAD FREE, LQFP-100
文件页数: 14/104页
文件大小: 1390K
代理商: 71M6513-IGT/F
71M6513/71M6513H
3-Phase Energy Meter IC
DATA SHEET
SEPTEMBER 2011
2005-2011 Teridian Semiconductor Corporation
Page: 17 of 104
A Maxim Integrated Products Brand
when the MPU executes a MOVX @Ri,A or MOVX @DPTR,A instruction. The MPU reads external data memory by executing
a MOVX A,@Ri or MOVX A,@DPTR instruction (SFR USR2 provides the upper 8 bytes for the MOVX A,@Ri instruction).
Clock Stretching: MOVX instructions can access fast or slow external RAM and external peripherals. The three low ordered
bits of the CKCON register define the stretch memory cycles. Setting all the CKCON stretch bits to one allows access to very
slow external RAM or external peripherals.
Table 4 shows how the signals of the External Memory Interface change when stretch values are set from 0 to 7. The widths of
the signals are counted in MPU clock cycles. The post-reset state of the CKCON register, which is in bold in the table,
performs the MOVX instructions with a stretch value equal to 1.
CKCON register
Stretch Value
Read signals width
Write signal width
CKCON.2
CKCON.1
CKCON.0
memaddr
memrd
memaddr
memwr
0
1
2
1
0
1
2
3
1
0
1
0
2
3
4
2
0
1
3
4
5
3
1
0
4
5
6
4
1
0
1
5
6
7
5
1
0
6
7
8
6
1
7
8
9
7
Table 4: Stretch Memory Cycle Width
There are two types of instructions, differing in whether they provide an eight-bit or sixteen-bit indirect address to the external
data RAM.
In the first type (MOVX A,@Ri), the contents of R0 or R1, in the current register bank, provide the eight lower-ordered bits of
address. The eight high-ordered bits of address are specified with the USR2 SFR. This method allows the user paged access
(256 pages of 256 bytes each) to the full 64KB of external data RAM. In the second type of MOVX instruction (MOVX
A,@DPTR), the data pointer generates a sixteen-bit address. This form is faster and more efficient when accessing very large
data arrays (up to 64 Kbytes), since no additional instructions are needed to set up the eight high ordered bits of address.
It is possible to mix the two MOVX types. This provides the user with four separate data pointers, two with direct access and
two with paged access to the entire 64KB of external memory range.
Dual Data Pointer: The Dual Data Pointer accelerates the block moves of data. The standard DPTR is a 16-bit register that is
used to address external memory or peripherals. In the 80515 core, the standard data pointer is called DPTR, the second data
pointer is called DPTR1. The data pointer select bit chooses the active pointer. The data pointer select bit is located at the LSB
of the DPS register (DPS.0). DPTR is selected when DPS.0 = 0 and DPTR1 is selected when DPS.0 = 1.
The user switches between pointers by toggling the LSB of the DPS register. All DPTR-related instructions use the currently
selected DPTR for any activity.
The second data pointer may not be supported by certain compilers.
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相关代理商/技术参数
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71M6513-IGTR/F 功能描述:计量片上系统 - SoC 3-Phase Energy Meter I/C RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6513-IGTR/F1 功能描述:计量片上系统 - SoC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6515H 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Energy Meter IC
71M6515H_11 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Up to 10ppmC precision ultra-stable voltage reference Digital temperature compensation
71M6515H-DB 功能描述:开发板和工具包 - 8051 71M6515H Demo Brd RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: