r8a66174sp Renesas Electronics Corporation., r8a66174sp Datasheet - Page 10

• Manufacturer Part Number: r8a66174sp
• Description: Parallel-in Serial-out Data Buffer With Fifo
• Manufacturer: Renesas Electronics Corporation.

R8A66174SP
REJ03F0278-0101 Rev.1.01 Oct.06.2008
Page 10 of 11
LED illuminating unit
Control unit
Power-on
circuit
HC373 : D type latch circuit(8 bit)
HC138 : 3 to 8 decoder
R8A66160 : LED driver(-24mA, cathode common)
(R8A66161 : LED driver(+24mA, anode common)
reset
A
Fig. 3 Application example 1(PPC copying machine eraser circuit)
CK
S
X
RESET
X
R8A66160
OE
OUT
IN
AD
A
0
CK
8
~AD
~A
ALE
WR
INT
L
RD
15
Φ
7
SQP
LE
D
HC373
Interrupt
control circuit
Φ
RESET
INT
. . . .
. . . .
. . . .
Q
C/D
A
0
~A
A
A
SDATA
0
15
D
0
~D
A
D
A
R8A66174SP
12
0
0
~A
~D
7
ROM
~A
OE
12
SCLK
7
CE
CK
15
Y
R8A66160
S
A
Y
0
WR
OE LATCH
OE
HC138
A
1
A
D
0
0
~A
A
~D
RAM
CK
WR
2
12
7
L
CS
CS
Y
Y
Control unit
7-segment display unit
Power-on
circuit
reset
X
X
RESET
A
OUT
Fig. 4 Application example 2(Panel display circuit)
IN
AD
CK
A
0
S
8
~AD
~A
ALE
WR
INT
RD
R8A66160
15
Φ
7
OE
CK
LE
D
HC373
Interrupt
control circuit
Φ
RESET
L
SQP
INT
Q
A
C/D
0
~A
SDATA
A
A
0
15
D
0
CK
~D
A
A
D
R8A66174SP
0
12
0
~A
~D
7
S
ROM
~A
OE
SCLK
12
7
R8A66160
15
CE
Y
OE
A
Y
0
WR
OE LATCH
CK
A
HC138
1
L
A
D
SQP
0
0
~A
~D
A
RAM
WR
2
12
7
CS
CS
Y
Y