isp1109 NXP Semiconductors, isp1109 Datasheet - Page 31

• Manufacturer Part Number: isp1109
• Description: Universal Serial Bus Transceiver With Carkit Support
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13355
Product data sheet
9.4.4 Read format
Table 42:
Figure 9
A read operation can be performed in two ways:
Byte
Register address K
ACK
Write data K
ACK
Write data K + 1
ACK
:
Write data K + N
ACK
P
Fig 9. Writing data to the ISP1109 registers.
•
•
S
S
Current address read: to read the register at the current address.
– Single-register read.
Random address read: to read N registers starting at a specified address. N defines
the number of registers to be read. If N = 1, only the start register is read.
– Single-register read
write data K + 2
device select
device select
illustrates the write format for a one-byte write and a multiple-byte write.
Transfer format description for a multiple-byte write
1
wr
wr
ACK
ACK
ACK
Description
master transmits address of register K. This is the start address for
writing multiple data bytes to consecutive registers. After a byte is written,
the register address is automatically incremented by 1.
Remark: If the master writes to a nonexistent register, the slave must
send a 'not ACK' and also must not increment the index address.
slave generates an acknowledgment
master writes data to register K
slave generates an acknowledgment
master writes data to register K + 1
slave generates an acknowledgment
:
master writes data to register K + N
K + N
it is possible that some registers may be overwritten, if the transfer is not
stopped before the rollover.
slave generates an acknowledgment
master generates a STOP condition
Rev. 01 — 14 July 2005
register address K
register address K
write data K + 3
1 becomes > 255, the register address rolls over to 0. Therefore,
one-byte write
multiple-byte write
ACK
ACK
ACK
.... maximum, rollover to 0
write data K
write data K
USB transceiver with carkit support
1. When the incremented address
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
…continued
ACK
ACK
ACK
P
write data K + N - 1
write data K + 1
ISP1109
004aaa569
ACK
ACK
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