
S1C6N3B0 TECHNICAL MANUAL
EPSON
35
CHAPTER 4: PERIPHERAL CIARCUITS AND OPERATION (LCD Driver)
4.6.5 Control of LCD driver
Table 4.6.5.1 shows the control bits of the LCD driver and their addresses. Figure 4.6.5.1 shows the
display memory map.
Table 4.6.5.1 I/O memory (LCD driver)
Address
Comment
D3
D2
Register
D1
D0
Name
Init 1
10
0FBH
CSDC ALLOFF ALLON
0
R/W
R
CSDC
ALLOFF
ALLON
0 3
0
1
0
– 2
Static
All Off
All On
–
Dynamic
Normal
–
LCD drive mode switch
LCD all-off control
LCD all-on control
Unused
1
2
Initial value at initial reset
Not set in the circuit
3
4
Always "0" being read
Reset (0) immediately after being read
Address
01
234
567
89
A
B
C
D
E
F
090
0A0
Display memory (W only)
32 words
× 4 bits
Fig. 4.6.5.1 Display memory map
CSDC: LCD drive switch (0FBH D3)
Selects the LCD drive method.
When "1" is written: Static drive
When "0" is written: Dynamic drive
Reading: Valid
At initial reset, this register is set to "0".
ALLOFF: LCD all OFF control register (0FBH D2)
Fade outs the all LCD segments.
When "1" is written: All LCD segments fade out
When "0" is written: Normal display
Reading: Valid
By writing "1" to the ALLOFF register, all the LCD segments goes off, and when "0" is written, it returns
to normal display. This function does not affect the contents of the display memory.
At initial reset, this register is set to "1".
ALLON: LCD all ON control register (0FBH D1)
Displays the all LCD segments on.
When "1" is written: All LCD segments displayed
When "0" is written: Normal display
Reading: Valid
By writing "1" to the ALLON register, all the LCD segments goes on, and when "0" is written, it returns to
normal display. This function does not affect the contents of the display memory.
At initial reset, this register is set to "0".