參數(shù)資料
型號(hào)： DS80C390-QNR
廠商： DALLAS SEMICONDUCTOR
元件分類： Microcontroller
英文描述： 8-BIT, 40 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 7/58頁
文件大?。?/td> 5486K
代理商： DS80C390-QNR
DS80C390
15 of 58
110199
The reset default of one Stretch cycle results in a three cycle MOVX for any external access. Therefore,
the default off-chip RAM access is not at full speed. This is a convenience to existing designs that utilize
slower RAM. When maximum speed is desired, software should select a Stretch value of zero. When
using very slow RAM or peripherals, the application software can select a larger Stretch value.
The specific timing of MOVX instructions as a function of Stretch settings is provided in the Electrical
Specifications section of this data sheet. As an example, Table 8 shows the read and write strobe widths
corresponding to each Stretch value.
DATA MEMORY CYCLE STRETCH VALUES Table 8
RD
, WR Pulse Width (in oscillator clocks)
MD2 MD1 MD0
Stretch
Cycle
Count
MOVX
Machine
Cycles
tMCS
(4X/ 2X = 1
CD1:0 = 00)
tMCS
(4X/ 2X = 0
CD1:0 = 00)
tMCS
(4X/ 2X = X
CD1:0 = 10)
tMCS
(4X/ 2X = X
CD1:0 = 11)
0
0*
2
0.5 tCLCL
1 tCLCL
2 tCLCL
2048 tCLCL
0
1
1**
3
tCLCL
2 tCLCL
4 tCLCL
4096 tCLCL
0
1
0
2
4
2 tCLCL
4 tCLCL
8 tCLCL
8192 tCLCL
0
1
3
5
3 tCLCL
6 tCLCL
12 tCLCL
12288 tCLCL
1
0
4
9
4 tCLCL
8 tCLCL
16 tCLCL
16384 tCLCL
1
0
1
5
10
5 tCLCL
10 tCLCL
20 tCLCL
20480 tCLCL
1
0
6
11
6 tCLCL
12 tCLCL
24 tCLCL
24576 tCLCL
1
7
12
7 tCLCL
14 tCLCL
28 tCLCL
28672 tCLCL
*All internal MOVX operations execute at the 0 Stretch setting.
** Default Stretch setting for external MOVX operations following reset.
EXTENDED STACK POINTER
The DS80C390 supports both the traditional 8-bit and an extended 10-bit stack pointer that improves the
performance of large programs written in high-level languages such as C.
The 10-bit stack pointer
feature is enabled by setting the Stack Address Mode bit, SA (ACON.2). The bit is cleared following a
reset, forcing the device to use an 8-bit stack located in the Scratchpad RAM area. When the SA bit is
The 10-bit stack pointer address is generated by concatenating the lower two bits of the Extended Stack
Pointer (ESP;9Bh) and the traditional 8051 Stack Pointer (SP;81h). The 10-bit stack pointer cannot be
enabled when the 4kB of SRAM is mapped as both program and data memory.
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DS80C390-FNR 8-BIT, 40 MHz, MICROCONTROLLER, PQFP64
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
DS80C400 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller
DS80C400_03 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller
DS80C400_07 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller
DS80C400_09 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller
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