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| 型号： | AT89LS53-12JC |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-Bit Microcontroller with 12K Bytes Flash |
| 中文描述： | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, MS-018AC, LCC-44 |
| 文件页数： | 9/31页 |
| 文件大小： | 490K |
| 代理商： | AT89LS53-12JC |
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AT89LS53
4-257
Data Memory - RAM
The AT89LS53 implements 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.
Programmable Watchdog Timer
The programmable Watchdog Timer (WDT) operates from
an independent oscillator. The prescaler bits, PS0, PS1
and PS2 in SFR WCON 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 setting the WDTEN bit in SFR
WCON (address = 96H). The WDT is reset by setting the
WDTRST bit in WCON. 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
0
0
16 ms
0
0
1
32 ms
0
1
0
64 ms
0
1
1
128 ms
1
0
0
256 ms
1
0
1
512 ms
1
1
0
1024 ms
1
1
1
2048 ms
Table 6.
SPDR—SPI Data Register
SPDR Address = 86H
Reset Value = unchanged
SPD7
SPD6
SPD5
SPD4
SPD3
SPD2
SPD1
SPD0
Bit
7
6
5
4
3
2
1
0
相关PDF资料 |
PDF描述 |
|---|---|
| AT89LS53 | 8-Bit Microcontroller with 12K Bytes Flash(宽电压范围、带12K字节闪速存储器的8位微控制器) |
| AT89LS8252 | 8-Bit Microcontroller with 8K Bytes Flash |
| AT89LS8252-12AC | 8-Bit Microcontroller with 8K Bytes Flash |
| AT89LS8252-12AI | 8-Bit Microcontroller with 8K Bytes Flash |
| AT89LS8252-12JC | 8-Bit Microcontroller with 8K Bytes Flash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89LS53-12JI | 功能描述:8位微控制器 -MCU Low V w/12k 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 |
| AT89LS53-12PC | 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 |
| AT89LS53-12PI | 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 |
| AT89LS53-12QC | 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 |
| AT89LS53-12QI | 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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