PCM1608

13

SBAS164A

FIGURE 8. Read Operation Timing.

10

00

00

00

X

X

XX

XXXX

X

XX

X

X

X

X

X

XX

X

X

XX

X

X

High Impedance

ML

MC

MDI

MDO

ML

MC

MDI

MDO

ML

MC

MDI

MDO

D7

D0

D6

D5

D4

D3

D2

D1

D0

High Impedance

D7

D6

D5

D4

INDEX “N – 1”

D3

D2

D1

D6

D7

D5

D4

D3

D2

D1

D0

INDEX “1”

INDEX “N”

INC = 1 (Auto-Increment Read)

10

00

00

00

X

XX

XXXX

X

High Impedance

D6

D7

D5

D4

D3

D2

D1

D0

INDEX “N”

INC = 0 (Single Register Read)

NOTES: (1) X = Don’t care. (2) Index which it begins to read in the read mode can set by REG[6:0] in Register 11, data from Register 1 to Register 12 can

be read by setting it as “INC = 1” in Register 11. For example, set REG[6:0] = “0001001” to read from Register 9. (INC = “0” or “1”.)

The details of the Read operation are shown in Figure 8. First,

Control Register 11 must be written with the index of the

register to be read back. Additionally, the INC bit must be set

to logic “0” in order to disable the Auto-Increment Read

function. The Read cycle is then initiated by setting ML to

logic “0” and setting the R/W bit of the control data word to

logic “1”, indicating a Read operation. MDO remains at a

high-impedance state until the last eight bits of the 16-bit read

cycle, which corresponds to the eight data bits of the register

indexed by the REG[6:0] bits of Control Register 11. The

Read cycle is completed when ML is set to “1”, immediately

after the MC clock cycle for the least significant bit of

indexed control register has completed.

AUTO-INCREMENT READ OPERATION

The Auto-Increment Read function allows for multiple regis-

ters to be read sequentially. The Auto-Increment Read func-

tion is enabled by setting the INC bit of Control Register 11

to “1”. The sequence always starts with Register 1, and ends

with the register indexed by the REG[6:0] bits in Control

Register 11.

Figure 8 shows the timing of the Auto-Increment Read

operation. The operation begins by writing Control Regis-

ter 11, setting INC to “1”, and setting REG[6:0] to the last

register to be read in the sequence. The actual Read opera-

tion starts on the next HIGH to LOW transition of the ML

pin.