isp1301 NXP Semiconductors, isp1301 Datasheet - Page 29

• Manufacturer Part Number: isp1301
• Description: Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
ISP1301_3
Product data sheet
12.4.1 Current address read
12.4 Read format
A read operation can be performed in two ways:
Figure 14
Table 38:
Byte
S
Device select
ACK
Read data K
No ACK
P
Fig 13. Writing data to the ISP1301 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
– Multiple register read
write data K + 2
device select
device select
illustrates the byte sequence.
Transfer format description for current address read
wr
wr
Description
master starts with a START condition
master transmits device address and read command bit R/W = 1
slave generates an acknowledgment
slave transmits and master reads data from register K. If the start address is
not specified, the read operation starts from where the index register is
pointing to because of a previous read or write operation.
master terminates the read operation by generating a No Acknowledge
master generates a stop condition
ACK
ACK
ACK
Rev. 03 — 21 February 2006
register address K
register address K
write data K + 3
one-byte write
multiple-byte write
ACK
ACK
ACK
.... maximum, rollover to 0
write data K
write data K
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
ACK
ACK
ACK
P
write data K + N - 1
USB OTG transceiver
write data K + 1
ISP1301
004aaa569
ACK
ACK
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P