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CHAPTER 21 400 kHz I
■ Ten Bit Address Mask Register (ITMK) Contents
Table 21.2-4 Function of Each Bit of the Ten Bit Address Mask Register (ITMK)
Bit name
ENTB:
bit15
Enable ten bit
slave address bit
RAL:
bit14
Received slave
address length bit
bit13 to
Undefined
bit10
TMK:
bit9 to bit0
Ten bit slave
address mask bits
424
2
C INTERFACE
This bit enables the ten bit slave address (and the acknowledging upon its reception).
Write access to this bit is only possible if the interface is disabled (EN= 0 in ICCR).
"0": Ten bit address disabled
"1": Ten bit address enabled
This bit indicates whether the interface was addressed as a seven or ten bit slave. It is
read only.
"0": Addressed as seven bit slave
"1": Addressed as ten bit slave
This bit can be used to determine whether the interface was addressed as a seven or ten
bit slave if both slave addresses are enabled (ENTB = 1 and ENSB = 1). Its contents is
only valid if the AAS bit in the IBSR register is "1". This bit is also reset if the interface
is disabled (EN= 0 in ICCR).
These bits always return "1" during reading.
This register is used to mask the ten bit slave address of the interface. Write access to
these bits is only possible if the interface is disabled (EN= 0 in ICCR).
"0": Bit is not used in slave address comparison
"1": Bit is used in slave address comparison
This can be used to make the interface acknowledge on multiple ten bit slave addresses.
Only the bits set to "1" in this register are used in the ten bit slave address comparison.
The received slave address is written back to the ITBA register and thus may be
determined by reading the ITBA register if the AAS bit in
the IBSR register is "1".
Note:
If the address mask is changed after the interface had been enabled, the slave address
should also be set again since it could have been overwritten by a previously
received slave address.
Function
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