User manual
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Doc. No: SAS1-D038-A
4
1.5 Pin Definition (Continued)
Pin Number Symbol I/O Function
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17
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BS0
BS1
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These pins are MCU interface selection input. See the
following table:
BS0 BS1
3-wire SPI 1 0
4-wire SPI 0 0
68XX-parallel (8-bit) 1 1
80XX-parallel (8-bit) 0 1
21 RES# I
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This pin is reset signal input. When the pin is low,
initialization of the chip is executed.
19 CS# I
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This pin is the chip select input. The chip is enabled fo
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MCU communication only when CS# is pulled low.
20 D/C# I
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This pin is Data/Command control pin. When the pin is
pulled high, the input at D7~D0 is treated as display data.
When the pin is pulled low, the input at D7~D0 will be
transferred to the command register. For detail
relationship to MCU interface signals, please refer to the
Timing Characteristics Diagrams.
When 3-wire serial mode is selected, this pin must be
connected to VSS.
15 E/RD# I
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This pin is MCU interface input. When interfacing to
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68XX-series microprocessor, this pin will be used as the
Enable (E) signal. Read/write operation is initiated whe
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this pin is pulled high and the CS# is pulled low.
When connecting to an 80XX-microprocessor, this pi
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receives the Read (RD#) signal. Data read operation is
initiated when this pin is pulled low and CS# is pulle
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low.
When serial mode is selected, this pin must be connecte
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to VSS.
16 R/W# I
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This pin is MCU interface input. When interfacing to
a
68XX-series microprocessor, this pin will be used as
Read/Write (R/W#) selection input. Pull this pin to
“High” for read mode and pull it to “Low” for write
mode.
When 80XX interface mode is selected, this pin will be
the Write (WR#) input. Data write operation is initiate
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when this pin is pulled low and the CS# is pulled low.
When serial mode is selected, this pin must be connecte
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to VSS.
7~14 D7~D0 I/O
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These pins are 8-bit bi-directional data bus to be
connected to the microprocessor’s data bus. When serial
mode is selected, D1 will be the serial data input SDIN
and D0 will be the serial clock input SCLK.
Unused pins must be connected to VSS except for D2.