參數(shù)資料
型號: IA8X44
廠商: Innovasic Semiconductor
英文描述: SDLC COMMUNICATIONS CONTROLLER
中文描述: SDLC的通信控制器
文件頁數(shù): 23/49頁
文件大?。?/td> 220K
代理商: IA8X44
IA8044/IA8344
Data Sheet
SDLC COMMUNICATIONS CONTROLLER
The state of bits RS1, RS0 selects the working registers bank as follows:
RS1/0
Bank selected location
00
Bank 0 (00H – 07H)
01
Bank 1 (08H – 0FH)
10
Bank 2 (10H – 17H)
11
Bank 3 (18H – 1FH)
Stack Pointer (SP):
The Stack Pointer is a 1-byte register initialized to 07H after reset. This register is incremented
before PUSH and CALL instructions, causing the stack to begin at location 08H. The stack pointer
points to a location in internal RAM.
SP
Bit: 7
6
5
4
SP.7
SP.6
SP.5
SP.4
Data Pointer (DPTR):
The Data Pointer (DPTR) is 2 bytes wide. The lower part is DPL, and the highest is DPH.
It can be loaded as 2 byte register (MOV DPTR,#data16) or as two registers (ea. MOV
DPL,#data8). It is generally used to access external code or data space (ea. MOVC
A,@A+DPTR or MOV A,@DPTR respectively).
DPH
Bit: 7
6
5
4
DPH.7
DPH.6
DPH.5
DPH.4
DPL
Bit: 7
6
5
4
DPL.7
DPL.6
DPL.5
DPL.4
Copyright
2003
innov
ASIC
The End of Obsolescence
ENG210010112-00
www.innovasic.com
Customer Support:
Page 23 of 49
1-888-824-4184
3
2
1
0
SP.3
SP.2
SP.1
SP.0
3
2
1
0
DPH.3
DPH.2
DPH.1
DPH.0
3
2
1
0
DPL.3
DPL.2
DPL.1
DPL.0
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