参数资料
| 型号： | AT89LS8252-12AI |
| 厂商： | Atmel |
| 文件页数： | 35/35页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU FLASH 8K 44TQFP |
| 标准包装： | 160 |
| 系列： | 89LS |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 12MHz |
| 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)： | 2.7 V ~ 6 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-TQFP |
| 包装： | 托盘 |
| 其它名称： | AT89LS825212AI |
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9
AT89LS8252
0850C–MICRO–3/06
Data Memory—EEPROM and RAM
Th e AT89 LS82 52 imp le me nts 2K b ytes of on -chip
EEPROM for data storage and 256 bytes of RAM. The
upper 128 bytes of RAM occupy a parallel space to the
Special Function Registers. That means the upper 128
bytes have the same addresses as the SFR space but are
physically separate from SFR space.
When an instruction accesses an internal location above
address 7FH, the address mode used in the instruction
specifies whether the CPU accesses the upper 128 bytes
of RAM or the SFR space. Instructions that use direct
addressing access SFR space.
For example, the following direct addressing instruction
accesses the SFR at location 0A0H (which is P2).
MOV 0A0H, #data
Instructions that use indirect addressing access the upper
128 bytes of RAM. For example, the following indirect
addressing instruction, where R0 contains 0A0H, accesses
the data byte at address 0A0H, rather than P2 (whose
address is 0A0H).
MOV @R0, #data
Note that stack operations are examples of indirect
addressing, so the upper 128 bytes of data RAM are avail-
able as stack space.
The on-chip EEPROM data memory is selected by setting
the EEMEN bit in the WMCON register at SFR address
location 96H. The EEPROM address range is from 000H to
7FFH. The MOVX instructions are used to access the
EEPROM. To access off-chip data memory with the MOVX
instructions, the EEMEN bit needs to be set to “0”.
The EEMWE bit in the WMCON register needs to be set to
“1” before any byte location in the EEPROM can be written.
User software should reset EEMWE bit to “0” if no further
EEPROM write is required. EEPROM write cycles in the
serial programming mode are self-timed and typically take
2.5 ms. The progress of EEPROM write can be monitored
by reading the RDY/BSY bit (read-only) in SFR WMCON.
RDY/BSY = 0 means programming is still in progress and
RDY/BSY = 1 means EEPROM write cycle is completed
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 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 VCC = 5V) are within ±30% of the
nominal.
The WDT is disabled by Power-on Reset and during Power
Down. It is enabled by setting 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.
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
Table 6. SPDR—SPI Data Register
SPDR Address = 86HReset Value = unchanged
SPD7
SPD6
SPD5
SPD4
SPD3
SPD2
SPD1
SPD0
Bit
76543210
相关PDF资料 |
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| AT89LS8252-12AC | IC MICRO CTRL 12MHZ 44TQFP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89LS8252-12AU | 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 |
| AT89LS8252-12JC | 功能描述:8位微控制器 -MCU Low V w/8k 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 |
| AT89LS8252-12JI | 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 |
| AT89LS8252-12PC | 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 |
| AT89LS8252-12PI | 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 |
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