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| M34E04B Datasheet, PDF (16/35 Pages) STMicroelectronics – 4-Kbit Serial Presence Detect EEPROM compatible | |||
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Device operation
#URRENT
!DDRESS
2EAD
2ANDOM
!DDRESS
2EAD
M34E04B
Figure 7. Read mode sequences
!#+
./ !#+
$EV SELECT
$ATA OUT
27
!#+
!#+
!#+
./ !#+
$EV SELECT
"YTE ADDRESS
$EV SELECT
$ATA OUT
27
27
3.7.3
3.7.4
3EQUENTIAL
#URRENT
2EAD
!#+
!#+
$EV SELECT
$ATA OUT
27
!#+
./ !#+
$ATA OUT .
3EQUENTIAL
2ANDOM
2EAD
!#+
!#+
!#+
!#+
$EV SELECT
"YTE ADDRESS
$EV SELECT
$ATA OUT
27
27
!#+
./ !#+
$ATA OUT .
!)B
Sequential read
This operation can be used after a Current address read or a Random address read. The
bus master does acknowledge the data byte output, and sends additional clock pulses so
that the device continues to output the next byte in sequence. To terminate the stream of
bytes, the bus master must not acknowledge the last byte, and must generate a Stop
condition, as shown in Figure 7.
The output data comes from consecutive addresses, with the internal address counter
automatically incremented after each byte output. After the last memory address, the
address counter ârolls-overâ, and the device continues to output data from memory address
00h.
Acknowledge in read mode
For all Read commands, after each byte read, the device waits for an acknowledgment
during the 9th bit time. If the bus master does not drive Serial Data (SDA) low during this
time, the device terminates the data transfer and switches to its Standby mode.
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DocID028428 Rev 1
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