Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
136
4.5.9.
7-bit Slave Address Register: ISBA
7-bit slave address register (ISBA) sets slave addresses.
ISBAn(n=3 to 8, 10, 11) : Address Base addr + 1F
H
(Access: Byte, Half-word,
Word)
7
6
5
4
3
2
1
0
bit
SAEN
SA6
SA5
SA4
SA3
SA2
SA1
SA0
0
0
0
0
0
0
0
0
Initial value
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Attribute
[bit7] SAEN: Slave address enable bit
This bit enables slave address detection.
Setting "0": Does not detect a slave address.
Setting "1": Compares the ISBA and ISMK values with the first byte received.
SAEN
Slave address enable bit
0
Disabled
1
Enabled
[bit6 to bit0] SA6-0: 7-bit slave address
⋅
If the slave address detect is enabled (SAEN=1), the 7-bit slave address register (ISBA) compares with
the 7-bit data received after a (repeat) start condition detected, and if all the bits are matched, it will
operate as a slave and output ACK. At that time, the slave address received will be set to this register. (If
SAEN=0, ACK will not be output.)
⋅
The address bits with "0" set on the ISMK register will be excluded from the comparison.
SA
Slave address setting bits
6 to 0
7-bit slave address
Notes:
⋅
The reserved address cannot be set.
⋅
Set this register when the EN bit of the ISMK register is "0".
MB91520 Series
MN705-00010-1v0-E
1449