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CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
4.5.4 I/O memory of LCD driver
Table 4.5.4.1 shows the control bits of the LCD driver and their addresses. Figure 4.5.4.1 shows the
display memory map.
Register
Address
D3
D2
LON
0
0F8H
R/W
R
∗1
Initial value at initial reset
∗2
Not set in the circuit
Address
0E0
LON: LCD display and power divider On/Off control (0F8H•D3)
The LCD display can be turned on or off with this switch. It also controls the power divider on or off if
the power divider is selected for the LCD power generator.
When 1 is written: LCD displayed
When 0 is written: LCD is all off
Reading: Valid
When the power divider is selected for the LCD power generator, power current consumption will
increase if this switch is turned on.
Keep this switch off (LON = 0) when LCD display is not necessary.
After an initial reset, LCD and the power divider is turned off.
CSDC: LCD drive switch (0F8H•D0)
The LCD drive format can be selected with this switch.
When 1 is written: Static drive
When 0 is written: Dynamic drive
Reading: Valid
After an initial reset, dynamic drive (CSDC = 0) is selected.
Display memory (0E0H–0EFH)
The LCD segments are turned on or off according to this data.
When 1 is written: On
When 0 is written: Off
Reading: Invalid
By writing data into the display memory allocated to the LCD segment (on the panel), the segment can be
turned on or off. After an initial reset, the contents of the display memory are undefined.
4.5.5 Programming note
Because the display memory is for writing only, re-writing the contents with computing instructions (e.g.,
AND, OR, etc.) which come with read-out operations is not possible. To perform bit operations, a buffer
to hold the display data is required on the RAM.
26
Table 4.5.4.1 Control bits of LCD driver
∗1
D1
D0
Name Init
LON
0
0
CSDC
∗3
∗2
0
–
∗3
∗2
0
–
R/W
CSDC
0
∗3
Always "0" being read
∗4
Reset (0) immediately after being read
0
1
2
3
4
Display memory (Write only)
Fig. 4.5.4.1 Display memory map
1
0
On
Off
LCD power and display On/Off conrol
–
–
Unused
–
–
Unused
Static
Dynamic
LCD drive switch
5
6
7
8
9
A
16 words x 4 bits
EPSON
Comment
B
C
D
E
F
S1C60N03 TECHNICAL MANUAL
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