D7225G NEC, D7225G Datasheet - Page 5

• Manufacturer Part Number: D7225G
• Description: Search -----> UPD7225G
• Manufacturer: NEC

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1.
1.1 SI (Serial Input)
commands for controlling the operation of the PD7225 can be input to this pin.
1.2 /SCK (Serial Clock)
serial register at the rising edge of this clock one bit at a time. /SCK input is effective when /CS = 0 and /BUSY = 1.
If /BUSY = 0, this input is ignored. If /CS = 1, this signal is ignored regardless of the /BUSY status.
1.3 C, /D (Command/Data)
high level indicates a command.
1.4 /BUSY
data input; a high level enables serial data input. This pin becomes high impedance when /CS = 1.
1.5 /CS (Chip Select)
input is enabled. At the same time, the data pointer is initialized to address 0. When /CS is set to high level after
serial data is input, the contents of the data memory are transferred to the display latch and displayed on the LCD.
1.6 /SYNC (SYNChronous)
operation is synchronized in a multi-chip configuration.
Figure 1-1), and synchronizes the system clock (f
display timing of each PD7225 is synchronized with the common drive signal timing shown in Figure 1-2.
This pin is used for inputting serial data (commands/data).
This pin is used for inputting the shift clock for serial data (SI input). The content of the SI input is read into the
This input indicates whether the signal input from the SI pin is a command or data. A low level indicates data; a
This is an active-low output pin that is used to control serial data input disable/enable. A low level disables serial
When /CS is changed from high level to low level, the SCK counter in the PD7225 is cleared and serial data
The /SYNC pin is used to make a wired-OR connection when the common pins are shared or when blinking
When the PD7225 is reset (/RESET = 0), the /SYNC pin outputs the clock frequency (f
/SYNC
PIN FUNCTIONS
f
CL
Tri-state output
Figure 1-1. /SYNC Pin Status During Reset (/RESET = 0)
Input
Input
Input
Input
Input/Output
Data Sheet S14308EJ6V0DS00
CL
/4) of the PD7225. When the reset is released (/RESET =1), the
Data to be displayed as well as 19 deffernet
CL
) divided by four (refer to
PD7225
5