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SAB82525H-V21 参数 Datasheet PDF下载

SAB82525H-V21图片预览
型号: SAB82525H-V21
PDF下载: 下载PDF文件 查看货源
内容描述: 高层次的串行通信控制器扩展 [High-Level Serial Communication Controller Extended]
分类和应用: 通信控制器
文件页数/大小: 126 页 / 741 K
品牌: SIEMENS [ Siemens Semiconductor Group ]
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SAB 82525  
SAB 82526  
SAF 82525  
SAF 82526  
Pin Definitions and Functions (cont’d)  
Pin No.  
Symbol Input (I)  
Function  
Output (O)  
P-LCC P-MQFP  
18  
23  
IM1  
I
Input Mode 1  
Connecting this pin to either VSS or VDD the bus interface can  
be adapted to either Siemens/Intel or Motorola  
environment.  
IM1 = LOW: Intel bus mode  
IM1 = HIGH: Motorola bus mode  
19  
24  
ALE/  
IM0  
I
Address Latch Enable (Intel bus mode)  
A high on this line indicates an address on the external  
address/data bus, which will select one of the HSCX’s  
internal registers. The address is latched by the HSCX with  
the falling edge of ALE. This allows the HSCX to be directly  
connected to a CPU with multiplexed address/data bus  
compatible to SAB 82520 HSCC.  
The address input pins A0-A6 must be externally  
connected to the data bus pins (D0-D6 for 8-bit CPU’s, D1-  
D7 for 16-bit CPU’s, i.e. multiply all internal register  
addresses by 2).  
This pin should be connected to high for a de-multiplexed  
bus.  
Input Mode 0, Motorola bus mode  
In Motorola Bus Mode, the level at this pin determines the  
function of the IC1 pin (see description of pin 6).  
20  
25  
V
SS  
I
I
Ground  
27  
26  
25  
24  
23  
22  
21  
32  
31  
30  
29  
28  
27  
26  
A0  
A1  
A2  
A3  
A4  
A5  
A6  
Address Bus  
These inputs interface with seven bits of the system’s  
address bus to select one of the internal registers for read  
or write.  
They are usually connected at A0-A6 in 8-bit systems or at  
A1-A7 in 16-bit systems.  
Semiconductor Group  
12  
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