7-Bit Slave Address Register (Isba) - Fujitsu MB91319 Series Hardware Manual

15.2.6

7-bit Slave Address Register (ISBA)

This section describes the configuration and functions of the 7-bit slave address
register (ISBA).
■ 7-bit Slave Address Register (ISBA)
Figure 15.2-10 shows the bit configuration of the 7-bit slave address register (ISBA).
Figure 15.2-10 Bit Configuration of the 7-bit Slave Address Register (ISBA)
Address:
ch0 0000BB
ch1 0000CB
ch2 0000DB
ch3 0000EB
Rewrite this register while operation is stopped (ICCR EN = 0).
[bit7] Reserved bit
This bit is reserved.
The value read from this bit is 0.
[bit6 to bit0] Slave address bits A6 to A0
If a 7-bit slave address is enabled (ISMK ENSB = 1) when slave address data is received in
slave mode, these bits of ISBA and the received slave address data are compared. If a slave
address match is detected, an acknowledge is sent to the master and the AAS bit is set.
The I
7-bit read access after a repeated START condition is generated.
All bits of a slave address are masked using the setting of the ISMK. The received slave
address data is overwritten to the ISBA register. This register is enabled only when AAS
(IBSR register) is set to 1.
The I
address is specified or a general call is received.
H
H
H
Initial value
H
2
C interface returns an acknowledge in response to reception of the address header of a
2
C interface does not compare ISBA and the received slave address when a 10-bit slave
7 6 5 4
SA6 SA5 SA4
R R/W R/W R/W
0 0 0 0
2
CHAPTER 15 I C INTERFACE
3 2 1 0
SA3 SA2 SA1 SA0
R/W R/W R/W R/W
0 0 0 0
303