ENA1417 Datasheet, PDF (16/54 Pages) ON Semiconductor – Duty Dot Matrix LCD Display Controllers

LC75812PT
Notes: *16.
• DCRAM data write method when IM1 = 0, IM2 = 0
CE
CCB address
DI
DCRAM
(1)
24 bit
CCB address
(1)
24 bit
CCB address
(1)
24 bit
CCB address
(1)
24 bit
Instruction
Instruction
Instruction
execution time
execution time
execution time
(27μs) _{DCRAM data} (27μs) _{DCRAM data} (27μs)
write finishes
write finishes
DCRAM data
write finishes
Instruction
execution time
(27μs) _{DCRAM data}
write finishes
• DCRAM data write method when IM1 = 1, IM2 = 0
(Instructions other than the “DCRAM data write” instruction cannot be executed.)
CE
CCB address
DI
DCRAM
(2)
24 bit
CCB address
CCB address
(3)
(3)
8 bit
8 bit
CCB address
CCB address
CCB address
(3)
(3)
8 bit
8 bit
(4)
16 bit
Instruction
execution time
(27μs)
DCRAM data
write finishes
Instruction
Instruction
Instruction
Instruction
Instruction
execution time execution time
execution time
execution time
execution time
(27μs)
(27μs)
(27μs)
(27μs)
(27μs)
DCRAM data
DCRAM data
DCRAM data DCRAM data
write finishes
write finishes
write finishes write finishes
Instructions other than the “DCRAM data write” instruction
cannot be executed.
• DCRAM data write method when IM1 = 0, IM2 = 1
DCRAM data
write finishes
CE
CCB address
DI
(5)
n bit
DCRAM
Instruction
execution time
(tiμs)
CCB address
(5)
n bit
DCRAM data
write finishes
Instruction
execution time
(tiμs)
DCRAM data
write finishes
CCB address
(5)
n bit
Instruction
execution time
(tiμs)
DCRAM data
write finishes
t(in==183m.5+μ_1s6×,(mn8
-1)
is an
integer
between
2
and
13
that
is
the
number
of
characters
written
as
DCRAM
data.)
For example
When n= 32 bits (m=2): ti= 40.5μs (fosc=300kHz, fCK=300kHz)
When n= 80 bits (m=8) : ti=121.5μs (fosc=300kHz, fCK=300kHz)
When n=120 bits (m=13): ti=189.0μs (fosc=300kHz, fCK=300kHz)
Note that the instruction execution time of 27μs and ti values in μs apply when fosc=300kHz and fCK=300kHz, and
that these execution times will differ when the CR oscillator frequency fosc and external clock frequency fCK differ.
No.A1417-16/54