isp1302 NXP Semiconductors, isp1302 Datasheet - Page 37

• Manufacturer Part Number: isp1302
• Description: Isp1302 Universal Serial Bus On-the-go Transceiver With Carkit Support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
10. Clock wake-up scheme
ISP1302_1
Product data sheet
Fig 13. Random address read
S
S
10.1 Power-down event
device select
read data K + 1
device select
Table 53.
The following subsections explain the ISP1302 clock stop timing, events triggering the
clock to wake up, and the timing of the clock wake-up.
The internal clock (LazyClock and/or I
takes t
clock always stops at its falling edge.
The internal clock must be woken up first before any register read or write operation.
SDA line
ACK
S
Device select
ACK
Read data K
ACK
Read data K + 1
ACK
:
Read data K + N
No ACK
P
d(clkstp)
wr
wr
ACK
ACK
ACK
Transfer format description for a multiple-byte read
for the clock to stop from the time the power-down condition is detected. The
register address K
register address K
read data K + 2
1 slave transmits and master reads data register K + N
random address single read
Description
slave generates an acknowledgment
master restarts with a START condition
master transmits the device address and read command bit R/W = 1
slave generates an acknowledgment
slave transmits and master reads data from register K. After a byte is read,
the address is automatically incremented by 1.
master generates an acknowledgment
slave transmits and master reads data from register K + 1
master generates an acknowledgment
:
register to read. After incrementing, the address rolls over to 0. Here, N
represents the number of addresses available in the slave.
master terminates the read operation by generating a no acknowledgement
master generates a STOP condition
random access multiple read
Rev. 01 — 24 May 2007
ACK
ACK
ACK
.... maximum, rollover to 0
S
S
device select
2
device select
C-bus clock) is stopped when bit PWR_DN is set. It
USB OTG transceiver with carkit support
ACK
rd
rd
ACK
ACK
write data K + N - 1
read data K
read data K
…continued
004aaa571
no ACK
1. This is the last
© NXP B.V. 2007. All rights reserved.
no ACK
ACK
ISP1302
P
P
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