Seiko Instruments G1216B1N000 user manual Operating Instructions, Mpu, CS1 CS2

AN.No.G1216B1N000-3D0E

3.OPERATING INSTRUCTIONS

3.1Terminal Functions

Table 1 Terminal Functions

Signal	QTY	I/O	Destination			Functions
DB0 to DB7	8	I/O	MPU	Common terminal for tristate input and output, and data bus.
E	1	Input	MPU	Enable
				Write (R/W=0):Latches data of DB0 to DB7 at the fall of E.
				Read (R/W=1):Outputs data to DB0 to DB7 while “E” keeps a
				high level.
R/W	1	Input	MPU	Read/Write selection
				R/W=1: When E=1 and CS1=0 or CS2=0, the data is output
					to DB0 to DB7 and read is available by MPU.
				R/W=0: When CS1=0 or CS2=0, DB0 to DB7 are ready for
					receiving the input.
D/I	1	Input	MPU	Data/Instruction selection
				D/I=1: Indicates that the data in DB0 to DB7 is the display
					data.
				D/I=0: Indicates that the data in DB0 to DB7 is the instruction
					code.
CS1, CS2	2	Input	MPU	Chip select input. Data input and output is possible under
				the following status:
								LCM display screen
					Terminal No.	CS1	CS2
									CS1	CS2
					Status	0	0
				CS1: Controls the LCM left half display screen (SEG1 to
				SEG64).
				CS2: Controls the LCM right half display screen (SEG65 to
				SEG128).
RST	1	Input	MPU	Reset signal
				Setting the RST signal to a low level allows for initial setup.
					(1) ON /OFF register: 0 setup (display OFF)
					(2) Display start line register: 0 line setup (display starts
					from 0 line)
				The setup status is retained until the status is changed by an
				instruction after reset is released.
VDD	1		Power	Power terminal for logic (+5 V)
VSS	1		Power	GND terminal (0 V)
VLC	1		Power	Power terminal for LC drive
LEDA	1		Power	LED backlight anode terminal
LEDC	1		Power	LED backlight cathode terminal
FGND	1	￿	￿	Frame ground1

1FGND terminal is connected to the metallic frame of the module. Use this terminal when grounding the frame.

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