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參數(shù)資料
| 型號： | DS80C390-FNR |
| 元件分類： | 微處理器 |
| 英文描述： | Dual CAN High-Speed Microprocessor |
| 中文描述： | 雙CAN高速微處理器 |
| 文件頁數(shù)： | 15/58頁 |
| 文件大?。?/td> | 5486K |
| 代理商： | DS80C390-FNR |
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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
MD2 MD1 MD0
Stretch
Cycle
Count
RD
,
WR
Pulse Width (in oscillator clocks)
t
MCS
(4X/
2X
= 1
CD1:0 = 00)
CD1:0 = 00)
0.5 t
CLCL
1 t
CLCL
t
CLCL
2 t
CLCL
2 t
CLCL
4 t
CLCL
3 t
CLCL
6 t
CLCL
4 t
CLCL
8 t
CLCL
5 t
CLCL
10 t
CLCL
6 t
CLCL
12 t
CLCL
7 t
CLCL
14 t
CLCL
MOVX
Machine
Cycles
t
MCS
(4X/
2X
= 0
t
MCS
(4X/
2X
= X
CD1:0 = 10)
2 t
CLCL
4 t
CLCL
8 t
CLCL
12 t
CLCL
16 t
CLCL
20 t
CLCL
24 t
CLCL
28 t
CLCL
t
MCS
(4X/
2X
= X
CD1:0 = 11)
2048 t
CLCL
4096 t
CLCL
8192 t
CLCL
12288 t
CLCL
16384 t
CLCL
20480 t
CLCL
24576 t
CLCL
28672 t
CLCL
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0*
1**
2
3
4
5
6
7
2
3
4
5
9
10
11
12
*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.
相關PDF資料 |
PDF描述 |
|---|---|
| DS80C390-QCR | Dual CAN High-Speed Microprocessor |
| DS80C410 | Network Microcontrollers with Ethernet and CAN |
| DS80C410-FNY | Network Microcontrollers with Ethernet and CAN |
| DS80C411-FNY | Network Microcontrollers with Ethernet and CAN |
| DS8187 | |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS80C390-FNR+ | 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| DS80C390-QCR | 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| DS80C390-QCR+ | 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
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