MT8981D 查看數據表（PDF） - Zarlink Semiconductor Inc

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MT8981D

ISO-CMOS ST-BUS FAMILY Digital Switch

Zarlink Semiconductor Inc 

MT8981D

Mode

Control

Bits

(unused)

Memory

Select

Bits

(unused)

Stream

Address

Bits

Data Sheet

7

6

5

4

3

2

1

0

Bit

Name

Description

7 Split Memory When 1, all subsequent reads are from the Data Memory and writes are to the Connection Memory

Low, except when the Control Register is accessed again. When 0, the Memory Select bits specify

the memory for subsequent operations. In either case, the Stream Address Bits select the subsection

of the memory which is made available.

6

Message When 1, the contents of the Connection Memory Low are output on the Serial Output streams

Mode except when the ODE pin is low. When 0, the Connection Memory bits for each channel determine

what is output.

5

(unused)

4-3 Memory 0-0 - Not to be used

Select Bits 0-1 - Data Memory (read only from the microprocessor port)

1-0 - Connection Memory Low

1-1 - Connection Memory High

2

(unused) Must be a 0.

1-0

Stream The number expressed in binary notation on these bits refers to the input or output ST-BUS stream

Address Bits which corresponds to the subsection of memory made accessible for subsequent operations.

Figure 4 - Control Register Bits

6

Zarlink Semiconductor Inc.

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