9UMS9633B datasheet(12/23 Pages) RENESAS

12 / 23 page

R31DS0110EU0100 Rev.1.00

Page 12

Jan 18, 2022

9UMS9633B Datasheet

3. General SMBus Serial Interface Information

How to Write

▪ Controller (host) sends a start bit

▪ Controller (host) sends the write address

▪ Renesas clock will

acknowledge

▪ Controller (host) sends the beginning byte location

= N

▪ Renesas clock will

acknowledge

▪ Controller (host) sends the byte count = X

▪ Renesas clock will

acknowledge

▪ Controller (host) starts sending Byte

N through

Byte N+X-1

▪ Renesas clock will

acknowledge each byte one at

a time

▪ Controller (host) sends a stop bit

How to Read

▪ Controller (host) will send a start bit

▪ Controller (host) sends the write address

▪ Renesas clock will

acknowledge

▪ Controller (host) sends the beginning byte location

= N

▪ Renesas clock will

acknowledge

▪ Controller (host) will send a separate start bit

▪ Controller (host) sends the read address

▪ Renesas clock will

acknowledge

▪ Renesas clock will send the data byte count = X

▪ Renesas clock sends Byte

N+X-1

▪ Renesas clock sends

Byte 0 through Byte X (if

X(H) was written to Byte 8)

▪ Controller (host) will need to acknowledge each

byte

▪ Controller (host) will send a not acknowledge bit

▪ Controller (host) will send a stop bit

Index Block Write Operation

Controller (Host)

Renesas (Slave/Receiver)

starT bit

Slave Address

WRite

ACK

Beginning Byte = N

ACK

Data Byte Count = X

ACK

Beginning Byte N

ACK

Byte N + X - 1

ACK

stoP bit

Index Block Read Operation

Controller (Host)

Renesas

starT bit

Slave Address

WRite

ACK

Beginning Byte = N

ACK

Repeat starT

Slave Address

ReaD

ACK

Data Byte Count=X

ACK

Beginning Byte N

ACK

Byte N + X - 1

Not acknowledge

stoP bit

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