參數(shù)資料
型號(hào): ISP1109BS
廠商: NXP SEMICONDUCTORS
元件分類: 通用總線功能
英文描述: Universal Serial Bus transceiver with carkit support
中文描述: LINE TRANSCEIVER, PQCC32
封裝: LEAD FREE, 5 X 5 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT617-1, HVQFN-32
文件頁(yè)數(shù): 31/59頁(yè)
文件大小: 295K
代理商: ISP1109BS
9397 750 13355
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 14 July 2005
31 of 59
Philips Semiconductors
ISP1109
USB transceiver with carkit support
Figure 9
illustrates the write format for a one-byte write and a multiple-byte write.
9.4.4
Read format
A read operation can be performed in two ways:
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
Register address K
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
1. When the incremented address
K + N
1 becomes > 255, the register address rolls over to 0. Therefore,
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
ACK
Write data K
ACK
Write data K + 1
ACK
:
Write data K + N
1
ACK
P
Fig 9.
Writing data to the ISP1109 registers.
Table 42:
Byte
Transfer format description for a multiple-byte write
…continued
Description
004aaa569
S
device select
register address K
write data K
S
device select
register address K
write data K
write data K + 2
write data K + 3
write data K + 1
write data K + N - 1
P
P
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
one-byte write
multiple-byte write
.... maximum, rollover to 0
wr
wr
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