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| 型号： | DS89C430-QNL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/46页 |
| 文件大小： | 0K |
| 描述： | IC MCU FLASH 16KB 33MHZ 44-PLCC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 26 |
| 系列： | 89C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 33MHz |
| 连通性： | EBI/EMI，SIO，UART/USART |
| 外围设备： | 电源故障复位，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 16KB（16K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-LCC（J 形引线） |
| 包装： | 管件 |
| 产品目录页面： | 703 (CN2011-ZH PDF) |
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DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
27 of 46
External Data Memory Interface in Nonpage Mode Operation
Just like the program memory cycle, the external data memory cycle is four times slower than the internal data
memory cycle in nonpage mode. A basic internal memory cycle contains one system clock and a basic external
memory cycle contains four system clocks for nonpage mode operation.
The DS89C430 allows software to adjust the speed of external data memory access by stretching the memory bus
cycle. CKCON (8Eh) provides an application-selectable stretch value for this purpose. Software can change the
stretch value dynamically by changing the setting of CKCON.2–CKCON.0. Table 5 shows the data memory cycle
stretch values and their effect on the external MOVX memory bus cycle and the control signal pulse width in terms
of the number of oscillator clocks. A stretch machine cycle always contains four system clocks.
Table 5. Data Memory Cycle Stretch Values
RD
/WR PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
MD2:MD0
STRETCH
CYCLES
4X/2X, CD1,
CD0 = 100
4X/2X, CD1,
CD0 = 000
4X/2X, CD1,
CD0 = X10
4X/2X, CD1,
CD0 = X11
000
0
0.5
1
2
2048
001
1
2
4
4096
010
2
4
8
8192
011
3
6
12
12,288
100
7
4
8
16
16,384
101
8
5
10
20
20,480
110
9
6
12
24
24,576
111
10
7
14
28
28,672
As Table 5 shows, the stretch feature supports eight stretched external data memory access cycles, which can be
categorized into three timing groups. When the stretch value is cleared to 000b, there is no stretch on external data
memory access and a MOVX instruction is completed in two basic memory cycles. When the stretch value is set to
1, 2, or 3, the external data memory access is extended by 1, 2, or 3 stretch machine cycles, respectively. Note
that the first stretch value does not result in adding four system clocks to the RD/WR control signals. This is
because the first stretch uses one system clock to create additional setup time and one system clock to create
additional address hold time. When using very slow RAM and peripherals, a larger stretch value (4–7) can be
selected. In this stretch category, one stretch machine cycle (4 system clocks) is used to stretch the ALE pulse
width, one stretch machine cycle is used to create additional setup, one stretch machine cycle is used to create
additional hold time, and one stretch machine cycle is added to the RD or WR strobes.
The following diagrams illustrate the timing relationship for external data memory access in full speed (stretch value
= 0), in the default stretch setting (stretch value = 1), and slow data memory accessing (stretch value = 4), when
the system clock is in divide-by-1 mode (CD1:CD0 = 10b).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS89C430-QNL+ | 功能描述:8位微控制器 -MCU Ultra-High-Speed Flash MCU 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 |
| DS89C430-QNL+ | 制造商:Maxim Integrated Products 功能描述:IC 8BIT MCU 8051 33MHZ LCC-44 |
| DS89C440 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers |
| DS89C440-ENG | 功能描述:IC MCU FLASH 32KB 25MHZ 44-TQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:89C 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:260 系列:73S12xx 核心处理器:80515 芯体尺寸:8-位 速度:24MHz 连通性:I²C，智能卡，UART/USART，USB 外围设备:LED，POR，WDT 输入/输出数:9 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-VFQFN 裸露焊盘 包装:管件 |
| DS89C440-ENL | 功能描述:IC MCU FLASH 32KB 33MHZ 44-TQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:89C 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:260 系列:73S12xx 核心处理器:80515 芯体尺寸:8-位 速度:24MHz 连通性:I²C，智能卡，UART/USART，USB 外围设备:LED，POR，WDT 输入/输出数:9 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-VFQFN 裸露焊盘 包装:管件 |
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