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Device
HDQ_ICLK
HDQ_IRQ
L
4
in
te
rc
o
n
n
e
c
t
HDQ_INT_STATUS
HDQ_CTRL_STATUS
HDQ_REVISION
HDQ_SYSCONFIG
HDQ_SYSSTATUS
HDQ_TX_DATA
HDQ_RX_DATA
32
32
32
32
32
32
32
HDQ/1-Wire
controller
Protocol
registers
System
registers
HDQ_FCLK
From PRCM module
To MPU
subsystem
interrupt
controller
To/from
bidir
buffer
hdq1wr-008
Public Version
HDQ/1-Wire Functional Description
www.ti.com
18.4 HDQ/1-Wire Functional Description
The HDQ/1-Wire module works with both the HDQ and 1-Wire protocols. The protocols use a single wire
to establish communication between the master and the slave. Both protocols use a return-to-1
mechanism; that is, after any command is driven, the line is pulled to a high level. This mechanism
requires an external pullup.
18.4.1 HDQ/1-Wire Block Diagram
shows the HDQ/1-Wire block diagram.
Figure 18-8. HDQ/1-Wire Block Diagram
The MODE bit HDQ.
[0] allows selection between the HDQ and 1-Wire protocols.
This bit is assumed static for design purposes. The configuration is in HDQ mode by default.
shows the protocol-dedicated register scheme.
2848
HDQ/1-Wire
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated