BU97501KV Datasheet, PDF (6/33 Pages) Rohm – Integrated RAM for display data

BU97501KV
Datasheet
(2) Read Mode (KEY RD command only)
The following occurs when Key Read by KEY RD command.
If KEY RD command is recognized at the rising edge of 8th CLK, it enters Read mode after the falling edge of 8th CLK
and then key data is output through DO.
Setting CSB=”H” can exit Read mode after or during Serial Data Transfer.
Figure 8. Serial Data Output Format
Command Transfer Method
After CSB=”H”→”L”, the 1st byte shall be a command.
Please refer to “Command Table”.
When set command except Data write(DATAWR), the next byte will be (continuously) a command.
When set DATAWR command, the following bytes will be display data bytes.
Command
Command
Command
Command
Display Data
…
(DATAWR)
Once it becomes display data transfer mode, it will not be able to send command.
If you send command again, please rise CSB=”H”.
Display Data Transfer Method
This LSI has Display Data RAM (DDRAM) of 51×4=204bit.
The relationship between data input and display data, DDRAM data and address are as follows.
Command
00001010 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 …
→ Display Data
Display data will be stored in DDRAM. The address to be written is specified by Address set (ADSET) command and the
address is automatically incremented in every 4bit data if 1/4 Duty mode or in every 3 bit if 1/3 Duty mode respectively.
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