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DS00001824A-page 19

USB375x

4.4.2.2

Similar to the read commands, the slave supports two types of write commands. The single write command is show in

Figure 4-9. The slave will always ACK the write data. Only the lower 4 bits of the register address are decoded. Writes

to undefined and read-only registers will be ignored.

The continuous write is shown in Figure 4-10. In this case after the ACK of the write data, the master will drive the next

register address. The continuous write will be terminated when the master asserts a STOP.

4.4.3

FIGURE 4-8:

FIGURE 4-9:

FIGURE 4-10:

TABLE 4-2:

MSB

LSB

11010

0

0

R/W

ACK

S

Register Addr [X]

ACK

7-bit Slave ID

0

R/W

R/W

P

Driven By

Master

Driven By

Slave

P

7-bit Slave ID

ACK

S

1

NACK

Register [X] Value

Register [X+1]

Value

ACK

P

R/W

Register [X] Value

ACK

Register X Addr

7-bit Slave ID

Driven By

Master

Driven By

Slave

S

0

ACK

ACK

AC K

S

R egi s t er A d d r

[ X ]

AC K

7 - bi t S l a v e

I D

0

R/ W

R/ W

P

Dr i v e n

B y

Ma s t e r

D r i v en

B y

Sl a v e

P

7- b i t S l av e

I D

AC K

S

1

NA CK

R e g i s t e r [X ] V a l u e

R e g i s t e r [ X + 1 ]

Va l u e

AC K