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DEM16216SYH-LY Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers

Part No. DEM16216SYH-LY
Description  DEM16216SYH-LY
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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DEM16216SYH-LY Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers

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DEM 16216 SYH-LY
Product Specification
11
10. INTERFACE WITH MPU IN BUS MODE
1) Interface with 8-bit MPU
When interfacing data length are 8-bit, transfer is performed all at once through 8-ports, from DB0 to DB7.
An example of the timing sequence is shown below.
2) Interface with 4-bit MPU
When interfacing data length are 4-bit, only 4 ports, from DB4 to DB7, are used as data bus.
At first, higher 4-bit (in case of 8-bit bus mode, the contents of DB4 to DB7) are transferred, and then the lower 4-bit
(in case of 8-bit bus mode, the contents of DB0 to DB3) are transferred. So transfer is performed in two parts. Busy
flag outputs”1”after the second transfer are ended.
Example of timing sequence is shown below.
RS
R/W
E
internal Singnal
DB7
internal Operation
Data
Data
Busy
Busy
No
Busy
instruction
Busy Flag
check
instruction
Busy Flag
check
Busy Flag
check
Figure 6.0 Example of 8-bit bus mode timing diagram
RS
R/W
E
internal Singnal
DB7
internal Operation
Busy
No
Busy
instruction
Busy Flag check
instruction
Busy Flag Check
Figure 7.0 Example of 4-bit bus mode timing
diagram


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