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参数资料
| 型号： | DS80C390-QNR |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Microcontroller |
| 英文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 8/58页 |
| 文件大小： | 5486K |
| 代理商： | DS80C390-QNR |
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DS80C390
16 of 58
110199
ENHANCED DUAL DATA POINTERS
The DS80C390 contains two data pointers, DPTR0 and DPTR1, designed to improve performance in
applications that require high data throughput. Incorporating a second data pointer allows the software to
greatly speed up block data (MOVX) moves by using one data pointer as a source register and the other
as the destination register.
DPTR0 is located at the same address as the original 8051 data pointer, allowing the DS80C390 to
execute standard 8051 code with no modifications. The second data pointer, DPTR1, is split between the
DPH1 and DPL1 SFRs, similar to the DPTR0 configuration. The active data pointer is selected with the
data pointer select bit SEL (DPS.0). Any instructions that reference the DPTR (i.e., MOVX A, @DPTR),
will select DPTR0 if SEL=0, and DPTR1 if SEL=1.
Because the bits adjacent to SEL are not
implemented, the state of SEL (and thus the active data pointer) can be quickly toggled by the INC DPS
instruction without disturbing other bits in the DPS register.
Unlike the standard 8051, the DS80C390 has the ability to decrement as well as increment the data
pointers without additional instructions. When the INC DPTR instruction is executed, the active DPTR
increments or decrements according to the ID1, ID0 (DPS.7-6), and SEL (DPS.0) bits as shown. The
inactive DPTR is not affected.
DATA POINTER AUTOINCREMENT/DECREMENT CONFIGURATION Table 9
ID1
ID0
SEL
Result of INC DPTR
X
0
Increment DPTR0
X
1
0
Decrement DPTR0
0
X
1
Increment DPTR1
1
X
1
Decrement DPTR1
Another useful feature of the device is its ability to automatically switch the active data pointer after a
DPTR-based instruction is executed. This feature can greatly reduce the software overhead associated
with data memory block moves, which toggle between the source and destination registers. When the
Toggle Select bit (TSL;DPS.5) is set to 1, the SEL bit (DPS.0) is automatically toggled every time one of
the following DPTR related instructions is executed.
INC DPTR
MOV DPTR, #data16
MOVC A, @A+DPTR
MOVX A, @DPTR
MOVX @DPTR, A
As a brief example, if TSL is set to 1, then both data pointers can be updated with two INC DPTR
instructions. Assume that SEL=0, making DPTR the active data pointer. The first INC DPTR increments
DPTR and toggles SEL to 1. The second instruction increments DPTR1 and toggles SEL back to 0.
INC DPTR
CLOCK CONTROL AND POWER MANAGEMENT
The DS80C390 includes a number of unique features that allow flexibility in selecting system clock
sources and operating frequencies. To support the use of inexpensive crystals while allowing full speed
operation, a clock multiplier is included in the processor’s clock circuit. Also, in addition to the standard
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相关代理商/技术参数 |
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|---|---|
| DS80C390-QNR+ | 功能描述:8位微控制器 -MCU Dual CAN 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 |
| DS80C400 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Network Microcontroller |
| DS80C400_03 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Network Microcontroller |
| DS80C400_07 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Network Microcontroller |
| DS80C400_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Network Microcontroller |
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