- 您现在的位置：买卖IC网 > PDF目录381506 > AT89S4D12 (Atmel Corp.) 8-Bit Microcontroller with 132K Bytes Flash Data Memory PDF资料下载
参数资料
| 型号： | AT89S4D12 |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-Bit Microcontroller with 132K Bytes Flash Data Memory |
| 中文描述： | 8位132K章字节的闪存数据存储器微控制器 |
| 文件页数： | 6/13页 |
| 文件大小： | 120K |
| 代理商： | AT89S4D12 |
AT89S4D12
4-286
Table 4.
SPSR—SPI Status Register
Table 5.
SPDR—SPI Data Register
Data Memory—Flash and RAM
The AT89S4D12 implements 128K bytes of on-chip Flash
for data storage and 256 bytes of RAM. The upper 128
bytes of RAM occupy a parallel space to the Special Func-
tion Registers. That means the upper 128 bytes have the
same addresses as the SFR space but are physically sepa-
rate 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 086H (which is SPDR).
MOV 086H, #data
Instructions that use indirect addressing access the upper
128 bytes of RAM. For example, the following indirect
addressing instruction, where R0 contains 086H, accesses
the data byte at address 086H, rather than SPDR (whose
address is 086H).
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 MOVX instructions are used to access the Flash data
memory.
Flash write cycles are self-timed and typically take 5 ms per
128-byte page. The progress of Flash write can be moni-
tored by reading the RDY/BSY bit (read-only) in SFR
MCON. RDY/BSY = 0 means programming is still in
progress and RDY/BSY = 1 means Flash write cycle is
completed and another write cycle can be initiated.
SPCR Address = AAH
Reset Value = 000X 0000B
SPIF
WCOL
—
—
—
—
—
—
Bit
7
6
5
4
3
2
1
0
Symbol
Function
SPIF
SPI Interrupt Flag. When a serial transfer is complete, the SPIF bit is set and an
interrupt is generated if SPIE = 1. The SPIF bit is cleared by reading the SPI status
register with SPIF and WCOL bits set, and then accessing the SPI data register.
WCOL
Write Collision Flag. The WCOL bit is set if the SPI data register is written during a data
transfer. During data transfer, the result of reading the SPDR register may be incorrect,
and writing to it has no effect. The WCOL bit (and the SPIF bit) are cleared by reading
the SPI status register with SPIF and WCOL set, and then accessing the 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 |
|---|---|
| AT89S4D12-12JC | 8-Bit Microcontroller with 132K Bytes Flash Data Memory |
| AT89S4D12-12JI | 8-Bit Microcontroller with 132K Bytes Flash Data Memory |
| AT89S4D12-12RC | 8-Bit Microcontroller with 132K Bytes Flash Data Memory |
| AT89S4D12-12RI | 8-Bit Microcontroller with 132K Bytes Flash Data Memory |
| AT89S51-24 | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89S4D12-12RC | 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 |
| AT89S4D12-12RI | 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 |
| AT89S51-24AC | 功能描述:8位微控制器 -MCU 4K ISP FLASH 2.7 TO 5.5V - 24 MHZ 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 |
| AT89S51-24AI | 功能描述:8位微控制器 -MCU 4K ISP FLASH 2.7 TO 5.5V - 24 MHz 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 |
| AT89S51-24AU | 功能描述:8位微控制器 -MCU 4K ISP FLASH 2.7 TO 5.5V - 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 |
发布紧急采购，3分钟左右您将得到回复。