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| 型号： | DS89C440-QNL |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/46页 |
| 文件大小： | 0K |
| 描述： | IC MCU FLASH 32KB 33MHZ 44-PLCC |
| 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： | 32KB（32K 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 |
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DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
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Table 2. SFR Reset Value (continued)
REGISTER
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TL2
CCh
0
TH2
CDh
0
PSW
D0h
0
FCNTL
D5h
1
0
1
0
FDATA
D6h
0
WDCON
D8h
0
Special
0
Special
0
Special
0
ACC
E0h
0
EIE
E8h
1
0
B
F0h
0
EIP1
F1h
1
0
EIP0
F8h
1
0
Note: Consult the Ultra-High-Speed Flash Microcontroller User’s Guide for more information about the bits marked “Special.”
Memory Organization
There are three distinct memory areas in the DS89C430: scratchpad registers, program memory, and data
memory. The registers are located on-chip but the program and data memory spaces can be on-chip, off-chip, or
both. The DS89C430/DS89C450 have 16kB/64kB of on-chip program memory, respectively, implemented in flash
memory and also have 1kB of on-chip data memory space that can be configured as program space using the
PRAME bit in the ROMSIZE feature. The DS89C430 uses a memory-addressing scheme that separates program
memory from data memory. The program and data segments can be overlapped since they are accessed in
different manners. If the maximum address of on-chip program or data memory is exceeded, the DS89C430
performs an external memory access using the expanded memory bus. The PSEN signal goes active low to serve
as a chip enable or output enable when performing a code fetch from external program memory. MOVX
instructions activate the RD or WR signal for external MOVX data memory access. The program memory
ROMSIZE feature allows software to dynamically configure the maximum address of on-chip program memory.
This allows the DS89C430 to act as a bootloader for an external memory. It also enables the use of the
overlapping external program spaces. The lower 128 bytes of on-chip flash memory—if ROMSIZE is greater than
0—are used to store reset and interrupt vectors. 256 bytes of on-chip RAM serve as a register area and program
stack, which are separated from the data memory.
Register Space
Registers are located in the 256 bytes of on-chip RAM labeled “internal registers” (Figure 6), which can be divided
into two sub areas of 128 bytes each. Separate classes of instructions are used to access the registers and the
program/data memory. The upper 128 bytes are overlapped with the 128 bytes of SFRs in the memory map.
Indirect addressing is used to access the upper 128 bytes of scratchpad RAM, while the SFR area is accessed
using direct addressing. The lower 128 bytes can be accessed using direct or indirect addressing.
There are four banks of eight working registers in the lower 128 bytes of scratchpad RAM. The working registers
are general-purpose RAM locations that can be addressed within the selected bank by any instructions that use
R0–R7. The register bank selection is controlled through the program status register in the SFR area. The contents
of the working registers can be used for indirect addressing of the upper 128 bytes of scratchpad RAM.
Individually addressable bits in the RAM and SFR areas support Boolean operations. In the scratchpad RAM area,
registers 20h–2Fh are bit addressable by software using Boolean operation instructions.
Another use of the scratchpad RAM area is for the stack. The stack pointer, contained in the SFRs, is used to
select storage locations for program variables and for return addresses of control operations.
相关PDF资料 |
PDF描述 |
|---|---|
| DS89C440-QNG | IC MCU FLASH 32KB 25MHZ 44-PLCC |
| DS89C440-MNL | IC MCU FLASH 32KB 33MHZ 40-DIP |
| DS89C440-MNG | IC MCU FLASH 32KB 25MHZ 40-DIP |
| DS89C440-ENL | IC MCU FLASH 32KB 33MHZ 44-TQFP |
| DS89C440-ENG | IC MCU FLASH 32KB 25MHZ 44-TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS89C440-QNL+ | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers |
| DS89C440-XXX | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers |
| DS89C450 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers |
| DS89C450+ENG | 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 64KB FLASH 5V 44TQFP - Trays |
| DS89C450+ENL | 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 64KB FLASH 5V 44TQFP - Trays |
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