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• Liquid Crystal Display Mode Setting RegisteR
For selection of the liquid crystal display mode, data I/O registers of R4, RS and R6 are used.
Table 9 Function of Liquid Crystal Display Mode Setting Registers
R41
R40
Function
0
0
Static
Selection of liquid crystal
O·
1
1/2 duty
display duty factor (R 40 , R 41 )
1
0
1/3 duty
1
1
1/4 duty
Designation of with or without
R42
Function
liquid crystal segment output
0
To be extended (Outputs display data from Channel R 1)
extension (R 42 )
1
Not to be extended (Channel R1 becomes an ordinary 4-bit data I/O.)
R60
Function
Liquid crystal display blanking
0
Outputs RAM data for liquid crystal display as segment signals.
signal (R 60 )
Segment signals become non-selection status (blanking) regardless of RAM
1
data for liquid crystal display.
RAM designation for liquid
RSI
Rso
Function
crystal display (R so , R S1 )
Function varies with liquid crystal display duty factor.
R63
R62
R61
R60
Function
Selection of
--------
0
0
-----
Do not set in this state.
halt function
and oscillation
~
0
1
~
With crystal for timer, with internal halt, XI, XO
circuit for
~
1
0
-----
Without crystal for timer, 0 14 and DIS are general I/O.
timer
----
1
1
----
With crystal for timer, without internal halt, XI, XO.
I/O state
0
~ ~
----
Enable:
at halt
1
~ ~
~
Disable:
(NOTE)
Liquid crystal display mode at resetting.
Since all bits of registers R4, R5 and RS are set to "1" by the reset function, display mode after resetting becomes as shown below:
Liquid crystal display duty factor: 1/4 duty
(R.
o = "1",
R ..
= "1")
Liquid crystal segment output extension: Not extended (R.
2
= "1")
Designation of liquid crystal display blanking: Display blanking (R
60
= "1")
Designation of RAM for liquid crystal display: Varies correspond to each liquid crystal display duty factor. (R so
=
"1", RSI
=
"1")
Designation of crystal for timer and internal halt: With crystal for timer, without internal halt
(R.
I
= "1",
R'
2
= "1"1.
I/O state at halt: I/O state at halt becomes disable (R
u
= "1"1.
205
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