Fujitsu MB90390 Series Hardware Manual page 454

CHAPTER 21 400 kHz I
2
■ I
C Seven Bit Slave Address Mask Register (ISMK)
This register contains the seven bit slave address mask and the seven bit mode enable bit. Write access to
this register is only possible if the interface is disabled (EN= 0 in ICCR).
R/W : Readable and writable
■ I 2
C Seven Bit Slave Address Mask Register Contents
Table 21.2-6 Function of Each Bit of the I
Bit name
ENSB:
bit15 Enable seven bit
slave address bit
SM6 to SM0:
bit14 to
Seven bit slave
bit8
address mask bits
426
2
C INTERFACE
bit 15 14 13
Address:
ENSB SM6 SM5 SM4 SM3 SM2 SM1SM0
0035A7
H
R/W R/W R/W R/W
2
C Seven Bit Slave Address Mask Register
This bit enables the seven bit slave address (and the acknowledging upon its reception).
"0": Seven bit slave address disabled
"1": Seven bit slave address enabled
This register is used to mask the seven bit slave address of the interface.
"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 seven bit slave
addresses. Only the bits set to "1" in this register are used in the seven bit slave address
comparison. The received slave address is written back to the ISBA register and may
thus may be determined by reading the ISBA 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.
12 11 10 9 8
ISMK
Initial value
0 1 1 1 1 1 1 1
R/W R/W R/W R/W
Function
B