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Data Sheet S13368EJ3V0DS00
27
μ
PD16682
12. COMMANDS
The
μ
PD16682 uses a combination of A0, /RD(E), and /WR(R,/W) to identify data bus signals. Command
interpretation and execution is performed using internal timing that does not depend on any external clock.
The 80 series MPU interface activates commands using low pulse input to the /RD pin during read and activates
commands using low pulse input to the /WR pin during write. The 68 series MPU interface sets read mode using
high-level input to the R,/W pin and sets write mode using low-level input to the R,/W pin. The command is activated
using high pulse input to the E pin.
Thus, the 68 series MPU interface differs from the 80 series MPU interface in that /RD(E) is at high level during
status read and display data read operations, as is shown in the command descriptions and command table.
Command descriptions using an 80 series MPU interface are shown below.
If the serial interface has been selected, data is input sequentially starting from D
7
.
12.1 Display ON/OFF
This command specifies the display’s ON/OFF status.
A0
E, /RD
R,/W, /WR
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Setting
0
1
0
1
0
1
0
1
1
1
1
Display ON
0
Display OFF
Executing the display all ON command while the display is OFF sets power save (low power) mode. For details, see
12.20 Power Save (Compound Command)
.
When the display is OFF, output via all driver outputs (segment and common) is at V
SS
level.
12.2 Display Start Line Set
This command specifies the address of the display start line in the display data RAM, as was shown in Figure 6
2.
The display area extends from the specified line address in the direction of higher line addresses, and includes the
number of lines that corresponds to the display duty setting. The display can be smoothly scrolled vertically by using
this command to dynamically modify the specified line addresses.
For details, see
6.4 Line Address Circuit
.
A0
E, /RD
R,/W, /WR
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Line Address
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
0
2
↓
↓
1
1
1
1
1
0
62
1
1
1
1
1
1
63