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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： | 7/58页 |
| 文件大小： | 5486K |
| 代理商： | DS80C390-QNR |
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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
set, the device will address up to 1kB of stack memory in the first 1kB of the internal MOVX memory.
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.
相关PDF资料 |
PDF描述 |
|---|---|
| DS80C390-FNR | 8-BIT, 40 MHz, MICROCONTROLLER, PQFP64 |
| DS80CH11 | 8-BIT, MICROCONTROLLER, PQFP128 |
| DS83C530-ENL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQFP52 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 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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