For both formats of Digital Interface, programma-

ble functions are configured by writing to a num-

ber of registers using a 2-byte write cycle.

Most of these registers can also be read-back for

verification. Byte one is always register address,

while byte two is Data.

Table 1 lists the register set and their respective

adresses.

Table 1: Programmable Register Intructions

Function

Address byte

Data byte

7654

3210

Single byte Power up/down

P

X

X

X

X

X

0

X

none

Write CR0

P

000001

X

see CR0 TABLE 2

Read-back CR0

P

0

0

0

0

1

1

X

see CR0

Write CR1

P

000101

X

see CR1 TABLE 3

Read-back CR1

P

0

0

0

1

1

1

X

see CR1

Write Data to receive path

P

001001

X

see CR2 TABLE 4

P

001011

X

see CR2

P

001101

X

see CR3 TABLE 5

Write CR4

P

010001

X

see CR4 TABLE 6

Read-back CR4

P

0

1

0

0

1

1

X

see CR4

Write CR5

P

010101

X

see CR5 TABLE 7

Read-back CR5

P

0

1

0

1

1

1

X

see CR5

Write CR6

P

011001

X

see CR6 TABLE 8

Read-back CR6

P

0

1

1

0

1

1

X

see CR6

Write CR7

P

011101

X

see CR7 TABLE 9

Read-back CR7

P

0

1

1

1

1

1

X

see CR7

Write CR8

P

100001

X

see CR8 TABLE 10

Read-back CR8

P

1

0

0

0

1

1

X

see CR8

Write CR9

P

100101

X

see CR9 TABLE 11

Read-back CR9

P

1

0

0

1

1

1

X

see CR9

Write CR10

P

101001

X

see CR10 TABLE 12

Read-back CR10

P

1

0

1

0

1

1

X

see CR10

Write CR11

P

101101

X

see CR11 TABLE 13

Read-back CR11

P

1

0

1

1

1

1

X

see CR11

Write Test Register CR14

P

111001

X

reserved

NOTE 1:

bit 7 of the address byte and data byte is always the first bit clocked into or out from: CI and CO pins when MICROWIRE serial

port is enabled.

X = reserved: write 0

NOTE 2:

”P” bit is Power up/down Control bit. P = 1 Means Power Down.

Bit 1 indicates, if set, the presence of a second byte.

NOTE 3:

Bit 2 is write/read select bit.

NOTE 4:

Registers CR12, CR13, and CR15 are not accessible.

ST5090

8/29