HD64F3664BPV Datasheet, PDF (322/446 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 17 EEPROM
17.4.6 Slave Addressing
The EEPROM device receives a 7-bit slave address and a 1-bit R/W code following the generation
of the start conditions. The EEPROM enables the chip for a read or a write operation with this
operation.
The slave address consists of a former 4-bit device code and latter 3-bit slave address as shown in
table 17.2. The device code is used to distinguish device type and this LSI uses "1010" fixed code
in the same manner as in a general-purpose EEPROM. The slave address code selects one device
out of all devices with device code 1010 (8 devices in maximum) which are connected to the I²C
bus. This means that the device is selected if the inputted slave address code received in the order
of A2, A1, A0 is equal to the corresponding slave address reference register (ESAR).
The slave address code is stored in the address H'FF09 in the EEPROM. It is transferred to ESAR
from the slave address register in the memory array during 10 ms after the reset is released. An
access to the EEPROM is not allowed during transfer.
The initial value of the slave address code written in the EEPROM is H'00. It can be written in the
range of H'00 to H'07. Be sure to write the data by the byte write method.
The next one bit of the slave address is the R/W code. 0 is for a write and 1 is for a read.
The EEPROM turns to a standby state if the device code is not "1010" or slave address code
doesn’t coincide.
Table 17.2 Slave Addresses
Bit Bit name
7
Device code D3
6
Device code D2
5
Device code D1
4
Device code D0
3
Slave address code A2
2
Slave address code A1
1
Slave address code A0
Initial
Value




0
0
0
Setting
Value
1
0
1
0
A2
A1
A0
Remarks
The initial value can be changed
The initial value can be changed
The initial value can be changed
Rev. 6.00 Mar. 24, 2006 Page 292 of 412
REJ09B0142-0600