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Renesas PCA4738L-64A Technical Information Seite 42

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Seitenansicht 41
39
3886 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
P47/SRDY1
/S1
P50/A0
P51/INT20
/S0
P52/INT30
/R
P53/INT40
/W
P42/INT0
/OBF00
P43/INT1
/OBF01
P46/SCLK1
/OBF10
Table 8 Function description of control I/O pins at bus interface function selected
Pin Name
OBF00
output
enable bit
OBF01
output
enable bit
OBF10
output
enable bit
Input
/Output
Functions
S1
A0
S0
R
W
OBF00
OBF01
OBF10
Chip select input
This is used for selecting the data bus buffer and is
selected at “L” level.
Address input
This is used for selecting DBBSTS and DBBOUT
when the host CPU is read.
This is used for distinguishing command from data
when writing to the host CPU.
Chip select input
This is used for selecting the data bus buffer and is
selected at “L” level.
This is a timing signal for reading data from the
data bus buffer to the host CPU.
This is a timing signal for writing data to the data
bus buffer by the host CPU.
Status output signal
OBF00 signal is output.
Status output signal
OBF01 signal is output.
Status output signal
OBF10 signal is output.
–
–
–
–
–
1
0
0
–
–
–
–
–
0
1
0
–
–
–
–
–
0
0
1
Input
Input
Input
Input
Output
Output
Output
Output
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