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M41ST85YMH Arkusz danych(PDF) 10 Page - STMicroelectronics

Numer części M41ST85YMH
Szczegółowy opis  5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST85YMH Arkusz danych(HTML) 10 Page - STMicroelectronics

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M41ST85Y, M41ST85W
10/34
READ Mode
In this mode the master reads the M41ST85Y/W
slave after setting the slave address (see Figure
11., page 10). Following the WRITE Mode Control
Bit (R/W=0) and the Acknowledge Bit, the word
address 'An' is written to the on-chip address
pointer. Next the START condition and slave ad-
dress are repeated followed by the READ Mode
Control Bit (R/W=1). At this point the master trans-
mitter becomes the master receiver.
The data byte which was addressed will be trans-
mitted and the master receiver will send an Ac-
knowledge Bit to the slave transmitter. The
address pointer is only incremented on reception
of an Acknowledge Clock. The M41ST85Y/W
slave transmitter will now place the data byte at
address An+1 on the bus, the master receiver
reads and acknowledges the new byte and the ad-
dress pointer is incremented to An+2.
This cycle of reading consecutive addresses will
continue until the master receiver sends a STOP
condition to the slave transmitter (see Figure
12., page 10).
The system-to-user transfer of clock data will be
halted whenever the address being read is a clock
address (00h to 07h). The update will resume ei-
ther due to a Stop Condition or when the pointer
increments to a non-clock or RAM address.
Note: This is true both in READ Mode and WRITE
Mode.
An alternate READ Mode may also be implement-
ed whereby the master reads the M41ST85Y/W
slave without first writing to the (volatile) address
pointer. The first address that is read is the last
one
stored
in
the
pointer
(see
Figure
13., page 11).
Figure 11. Slave Address Location
Figure 12. READ Mode Sequence
AI00602
R/W
SLAVE ADDRESS
START
A
0
100
0
11
AI00899
BUS ACTIVITY:
S
P
SDA LINE
BUS ACTIVITY:
MASTER
DATA n
DATA n+1
DATA n+X
WORD
ADDRESS (An)
SLAVE
ADDRESS
S
SLAVE
ADDRESS


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