参数资料
| 型号： | AT89S8252-24PI |
| 厂商： | Atmel |
| 文件页数： | 3/41页 |
| 文件大小： | 0K |
| 描述： | MCU W/SPI 8KB FLSH 2K EEP 40-DIP |
| 标准包装： | 9 |
| 系列： | 89S |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 24MHz |
| 连通性： | SPI，UART/USART |
| 外围设备： | POR，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 8KB（8K x 8） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 2K x 8 |
| RAM 容量： | 256 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4 V ~ 6 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 包装： | 管件 |
| 其它名称： | AT89S825224PI |
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11
AT89S8252
0401G–MICRO–3/06
programming is still in progress and RDY/BSY = 1 means EEPROM write cycle is com-
pleted and another write cycle can be initiated.
In addition, during EEPROM programming, an attempted read from the EEPROM will
fetch the byte being written with the MSB complemented. Once the write cycle is com-
pleted, true data are valid at all bit locations.
Programmable
Watchdog Timer
The programmable Watchdog Timer (WDT) operates from an independent internal
oscillator. The prescaler bits, PS0, PS1 and PS2 in SFR WMCON are used to set the
period of the Watchdog Timer from 16 ms to 2048 ms. The available timer periods are
shown in the following table and the actual timer periods (at V
CC = 5V) are within ±30%
of the nominal.
The WDT is disabled by Power-on Reset and during Power-down. It is enabled by set-
ting the WDTEN bit in SFR WMCON (address = 96H). The WDT is reset by setting the
WDTRST bit in WMCON. When the WDT times out without being reset or disabled, an
internal RST pulse is generated to reset the CPU.
Timer 0 and 1
Timer 0 and Timer 1 in the AT89S8252 operate the same way as Timer 0 and Timer 1 in
the AT89C51 and AT89C52. For further information on the timers’ operation, refer to the
Atmel web site (http://www.atmel.com). From the home page, select “Products”, then
“Microcontrollers, then “8051-Architecture”. Click on “Documentation”, then on “Other
Documents”. Open the document “AT89 Series Hardware Description”.
Timer 2
Timer 2 is a 16-bit Timer/Counter that can operate as either a timer or an event counter.
The type of operation is selected by bit C/T2 in the SFR T2CON (shown in Table 2).
Timer 2 has three operating modes: capture, auto-reload (up or down counting), and
baud rate generator. The modes are selected by bits in T2CON, as shown in Table 8.
Timer 2 consists of two 8-bit registers, TH2 and TL2. In the Timer function, the TL2 reg-
ister is incremented every machine cycle. Since a machine cycle consists of 12
oscillator periods, the count rate is 1/12 of the oscillator frequency.
In the Counter function, the register is incremented in response to a 1-to-0 transition at
its corresponding external input pin, T2. In this function, the external input is sampled
during S5P2 of every machine cycle. When the samples show a high in one cycle and a
low in the next cycle, the count is incremented. The new count value appears in the reg-
ister during S3P1 of the cycle following the one in which the transition was detected.
Table 7. Watchdog Timer Period Selection
WDT Prescaler Bits
Period (nominal)
PS2
PS1
PS0
0
16 ms
0
1
32 ms
0
1
0
64 ms
0
1
128 ms
1
0
256 ms
1
0
1
512 ms
1
0
1024 ms
1
2048 ms
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89S8252-24QC | 功能描述:8位微控制器 -MCU Microcontroller 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 |
| AT89S8252-W | 功能描述:8位微控制器 -MCU Microcontroller 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 |
| AT89S8253-24AC | 功能描述:8位微控制器 -MCU Microcontroller 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 |
| AT89S8253-24AI | 功能描述:8位微控制器 -MCU UNSAWN WAFER 20 MIL BACKGRIND - 24MHZ 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 |
| AT89S8253-24AU | 功能描述:8位微控制器 -MCU 12kB Flash 256B RAM 2.7V-5.5V 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 |
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