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If multiple data bytes are transmitted before a STOP condition is detected, these bytes are generally stored in subsequent
MMA7660FC internal registers because the register address generally auto-increments.
Master
ST
Device Address [6:0]
W
Register Address [6:0]
Data [7:0]
Data [7:0]
SP
Slave
AK
AK
AK
AK
Figure 13. Multiple Bytes Write
Message Format for Reading MMA7660FC
MMA7660FC is read using it’s internally stored register address as address pointer, the same way the stored register address
is used as address pointer for a write. The pointer generally auto-increments after each data byte is read using the same rules
as for a write. Thus, a read is initiated by first configuring the device’s register address by performing a write ( Figure 12 ) followed
by a repeated start. The Master Write address is 1001 1001 (0x99). The master can now read 'n' consecutive bytes from it, with
the first data byte being read from the register addressed by the initialized register address.
Master
ST
Device Address [6:0]
W
Register Address [6:0]
SR Device Address [6:0]
R
NAK SP
Slave
AK
AK
AK
Data [7:0]
Figure 14. Single Byte Read
Master
ST
Device Address [6:0]
W
Register Address [6:0]
SR Device Address [6:0]
R
AK
Slave
Master
Slave
Data [7:0]
AK
Data [7:0]
AK
AK
Data [7:0]
NAK SP
AK
AK
Data [7:0]
Figure 15. Multiple Bytes Read
MMA7660FC
Sensors
Freescale Semiconductor, Inc.
24
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