Rainbow Electronics MAX3107 - Manual (Page 46)

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MAX3107
SPI/I
2
C UART with 128-Word FIFOs
and Internal Oscillator
Burst Write
With this operation the master sends an address and
multiple data bytes to the slave device (Figure 19). The
burst write procedure is as follows:
1) The master sends a START condition.
2) The master sends the 7-bit slave ID plus a write bit (low).
3) The addressed slave asserts an ACK on the data
line.
4) The master sends the 8-bit register address.
5) The slave asserts an ACK on the data line only if the
address is valid (NACK if not).
6) The master sends 8 bits of data.
7) The slave asserts an ACK on the data line.
8) Repeat steps 6 and 7 N - 1 times.
9) The master generates a STOP condition.
Single-Byte Read
With this operation the master sends an address and
receives 1 or 2 data bytes from the slave device
(Figure 20). The read byte procedure is as follows:
1) The master sends a START condition.
2) The master sends the 7-bit slave ID plus a write bit (low).
3) The addressed slave asserts an ACK on the data line.
4) The master sends the 8-bit register address.
5) The active slave asserts an ACK on the data line only
if the address is valid (NACK if not).
6) The master sends a repeated START (Sr).
7) The master sends the 7-bit slave ID plus a read bit (high).
8) The addressed slave asserts an ACK on the data
line.
9) The slave sends 8 data bits.
10) The master asserts a NACK on the data line.
11) The master generates a STOP condition.
Figure 19. Burst Write Sequence
Figure 20. Read Byte Sequence
S DEVICE SLAVE ADDRESS - W A
8 DATA BITS - 1
BURST WRITE
A
REGISTER ADDRESS A
8 DATA BITS - N A
8 DATA BITS - 2 A
FROM MASTER TO STAVE FROM SLAVE TO MASTER
P
S
Sr
DEVICE SLAVE ADDRESS - W A
DEVICE SLAVE ADDRESS - R
READ SINGLE BYTE
A
REGISTER ADDRESS A
8 DATA BITS NA
FROM MASTER TO STAVE FROM SLAVE TO MASTER
P