SM8578BV Nippon_Precision_Circuits America, SM8578BV Datasheet - Page 11

• Manufacturer Part Number: SM8578BV
• Description: Real-time Clock ic
• Manufacturer: Nippon_Precision_Circuits America

Addressing
When CE goes HIGH for either a read or write cycle,
the initial input data comprises 4 mode select bits
followed by 4 address bits. Subsequent data is
read/written (depending on the mode selected) in 8-
Write cycle
When the first 4 bits of input data after CE goes
HIGH is 3
4 bits select the address to be written. The next 8 bits
of data are then written to the selected address, and
Read cycle
When the first 4 bits of input data after CE goes
HIGH is C
4 bits select the address to be read. 8-bit is then read
from the selected address, and then the address is
Note that if a mode select code other than 3
is input, all following data is ignored until a valid
mode select code occurs.
DATA
DATA
C E
CLK
CLK
C E
H
H
, write mode is selected. The subsequent
, read mode is selected. The subsequent
Write mode
select code(3
Read mode
select code(C
D0 D1 D2 D3 D0 D1 D2 D3
D0 D1 D2 D3
H
H
)
)
D0 D1
Adress
select(N)
Adress
select(N)
D2 D3
D0 D1
D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
H
Data read(adress N)
Data WRITE(adress N)
or C
From the point DATA is in output mode.
SM8578BV
D2 D3
H
D4 D5
bit units from/to the address selected. All input/out-
put data is in LSB-first format.
Note that if CE goes LOW before a complete 8-bit
unit of input data, the entire 8 bits of data are
ignored.
then the address is automatically incremented. Sub-
sequent input data is written to addresses in increas-
ing order. Note that the address following address F
is address 0
automatically incremented. Subsequent input data is
read from addresses in increasing order. Note that the
address following address F
D6 D7
H
.
D0 D1
DATA WRITE(adress N+1)
DATA read(adress N+1)
NIPPON PRECISION CIRCUITS—11
D2 D3
H
D4 D5
is address 0
D6 D7
H
.
H