M16C6K9 Datasheet, PDF (181/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
MULTI-MASTER I²C-BUS Interface
I²C Address Register
The I²C address register (address 032216, 033216, 031216) consists of a 7-bit slave address and a read/
write bit. In the addressing mode, the slave address written in this register is compared with the address
data to be received immediately after the START condition is detected.
•Bit 0: Read/write bit (RBW)
This is not used in the 7-bit addressing mode. In the 10-bit addressing mode, the first byte address data to
be received are compared with the contents (SAD6 to SAD0 + RBW) of the I²C address register.
The RBW bit is cleared to “0” automatically when the stop condition is detected.
•Bits 1 to 7: Slave address (SAD0–SAD6)
These bits store slave addresses. Regardless of the 7-bit addressing mode or the 10-bit addressing
mode, the address data transmitted from the master is compared with the contents of these bits.
I²C address register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
S0Di(i=0,1,2)
Address
032216,033216,031216
When reset
000000002
Bit Symbol
Bit name
RBW
Read/Write bit
SAD0
Slave address
SAD1
SAD2
Function
RW
This bit is using for comparing
with receiving address data in the
10-bit address mode. (Note)
For comparing with received
address data
SAD3
SAD4
SAD5
SAD6
Note.The RBW bit is cleared to "0" automatically when stop condition is detected
Fig.GC-4 I²C address register
Rev.1.00 Jun 06, 2003 page 181 of 290