ADL5309ACBZ-R7 datasheet(23/25 Pages) AD

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Data Sheet

ADL5309

SERIAL PORT INTERFACE

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Rev. 0 | 23 of 25

SHADOW ACCESS REGISTERS

The registers at Address 0x80 through Address 0x84 listed in

Table 10 are used to access the shadow registers listed in Table 9

through an indirect addressing method.

To read a shadow register, its address first has to be written to

REG_83. Then, the data can be read from REG_84. In order to

enable a write operation, the shadow registers first need to be

unlocked by writing 0xE5 to SREG_20 through an indirect write.

To perform an indirect write, use the autoincrement write method

to write the shadow register address to REG_80, the data to be

written to REG_81, and finally, set the WRITE_ENBL flag by writing

0x01 to REG_82, all in a single transaction. Subsequently, in a

new write operation, clear the WRITE_ENBL bit by writing 0x00 to

REG_82.

Table 10. ADL5309 Shadow Access Register Details

Address Name

Bits

Bit Name

Description

Default

Access

0x80

REG_80

[7:0]

WRITE_ADDR

Address of shadow register to write

0x00

R/W

0x81

REG_81

[7:0]

WRITE_DATA

Data to write to shadow register specified in register 0x80

0x00

R/W

0x82

REG_82

WRITE_ENBL

Set to '1' to enable a write to REG_80, REG_81

0x00

R/W

0x83

REG_83

[7:0]

READ_ADDR

Address of shadow register to read

0x00

R/W

0x84

REG_84

[7:0]

READ_DATA

Data read from shadow register specified in register 0x83.

0x00

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