s-24c04c Seiko Instruments Inc., s-24c04c Datasheet - Page 12

• Manufacturer Part Number: s-24c04c
• Description: 2-wire Serial E2prom
• Manufacturer: Seiko Instruments Inc.

12
2-WIRE SERIAL E
S-24C04C
5. Device addressing
To start communication, the master device on the system generates a start condition to the bus line. Next, the master
device sends 7-bit device address and a 1-bit read / write instruction code on to the SDA bus.
The higher 4 bits of the device address are the “Device Code”, and are fixed to “1010”.
In the S-24C04C, successive 2 bits are the “Slave Address”. These 2 bits are used to identify a device on the system
bus and are compared with the predetermined value which is defined by the address input pins (A2, A1). When the
comparison result matches, the slave device responds with an acknowledge during the 9th clock cycle.
The successive 1 bit (P0) is used to define a page address and choose the two 256-byte memory blocks (Address
000h to 0FFh and 100h to 1FFh).
S-24C04C
2
PROM
MSB
1
Device Code
0
Figure 13 Device Address
Seiko Instruments Inc.
1
0
A2
Address
Slave
A1
P0
R / W
LSB
Rev.2.0
_00_C