欢迎访问ic37.com |
会员登录 免费注册
发布采购

IA8344-PLC44I-01 参数 Datasheet PDF下载

IA8344-PLC44I-01图片预览
型号: IA8344-PLC44I-01
PDF下载: 下载PDF文件 查看货源
内容描述: SDLC通信控制器 [SDLC COMMUNICATIONS CONTROLLER]
分类和应用: 通信控制器外围集成电路装置时钟
文件页数/大小: 49 页 / 218 K
品牌: INNOVASIC [ INNOVASIC, INC ]
 浏览型号IA8344-PLC44I-01的Datasheet PDF文件第1页浏览型号IA8344-PLC44I-01的Datasheet PDF文件第2页浏览型号IA8344-PLC44I-01的Datasheet PDF文件第3页浏览型号IA8344-PLC44I-01的Datasheet PDF文件第4页浏览型号IA8344-PLC44I-01的Datasheet PDF文件第6页浏览型号IA8344-PLC44I-01的Datasheet PDF文件第7页浏览型号IA8344-PLC44I-01的Datasheet PDF文件第8页浏览型号IA8344-PLC44I-01的Datasheet PDF文件第9页  
IA8044/IA8344  
SDLC COMMUNICATIONS CONTROLLER  
Data Sheet  
Memory Organization  
Program Memory  
Program Memory includes interrupt and Reset vectors. The interrupt vectors are spaced at 8-  
byte intervals, starting from 0003H for External Interrupt 0.  
Reset Vectors  
Location  
0003H  
000BH  
0013H  
001BH  
0023H  
Service  
External Interrupt 0  
Timer 0 overflow  
External Interrupt 1  
Timer 1 overflow  
SIU Interrupt  
These locations may be used for program code, if the corresponding interrupts are not used  
(disabled). The Program Memory space is 64K, from 0000H to FFFFH. The lowest 4K of program  
code (0000H to 0FFFH) can be fetched from external or internal Program Memory. This selection is  
made by strapping pin ‘EA’ (External Address) to GND or VCC. If during reset, ‘EA’ is held low,  
all the program code is fetched from external memory. If, during reset, ‘EA’ is held high, the lowest  
4K of program code (0000H to 0FFFH) is fetched from internal memory (ROM). Program  
memory addresses above 4K (0FFFH) will cause the program code to be fetched from external  
memory regardless of the setting of ‘EA’.  
Data Memory  
External Data Memory  
The IA8044/IA8344 Microcontroller core incorporates the Harvard architecture, with separate  
code and data spaces. The code from external memory is fetched by ‘psen’ strobe, while data  
is read from RAM by bit 7 of P3 (read strobe) and written to RAM by bit 6 of P3 (write strobe). The  
External Data Memory space is active only by addressing through use of the MOVX instruction and  
the 16-bit Data Pointer Register (DPTR). A smaller subset of external data memory (8 bit  
addressing) may be accessed by using the MOVX instruction with register indexed addressing.  
Internal Data Memory  
The Internal Data Memory address is always 1 byte wide. The memory space is 192 bytes  
large (00H to BFH), and can be accessed by either direct or indirect addressing. The Special  
Function Registers occupy the upper 128 bytes. This SFR area is available only by direct  
addressing. Internal memory that overlaps the SFR address space is only accessible by indirect  
addressing.  
Copyright 2003  
innovASIC  
ENG210010112-00  
www.innovasic.com  
Customer Support:  
1-888-824-4184  
The End of Obsolescence  
Page 5 of 49