Rainbow-electronics AT83C26 Manual de usuario descargar pdf (Pagina 11)

7511B–SCR–10/05

AT83C26

Figure 1. Data transfer on TWI bus

Address Byte The first byte to send to the device is the address byte. The device controls if the hardware

address (A2/CK, A1/RST pins on reset) corresponds to the address given in the address byte

(A2, A1 bits).

If the level is not stable on A2/CK pin at reset, the user has to manage the possible address

taken by the device.

Figure 2. Address Byte

Up to 4 devices can be connected on the same TWI bus. Each device is configured with a differ-

ent combination on A2/CK, A1/RST pins. The address byte of each device for read/write

operations are listed below.

SDA

SCL

start condition

stop condition

1234

acknowledgement

from slave

Address byte

command

and/or data

Table 2. Address Byte Values

(A2/CK pin)

(A1/RST pin)

Address Byte

for

Read

Command

Address Byte

for

Write

Command

0 0 0x43 0x42

0 1 0x47 0x46

1 0 0x4B 0x4A

1 1 0x4F 0x4E

b7 b6 b5 b4 b3 b2 b1 b0

0A2

R/W

Slave Address on 7 Bits

1 for READ Command

0 for WRITE Command

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 76 77

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Rainbow-electronics AT83C26 Manual de usuario Pagina 11

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