Datasheet

REV. A

AD73360

–14–

SPORT Register Maps

There are eight control registers for the AD73360, each eight

bits wide. Table V shows the control register map for the

AD73360. The first two control registers, CRA and CRB, are

reserved for controlling the SPORT. They hold settings for

parameters such as bit rate, internal master clock rate and de-

vice count. If multiple AD73360s are cascaded, registers CRA

and CRB on each device must be programmed with the same

setting to ensure correct operation (this is shown in the pro-

gramming examples). The other six registers; CRC through

CRH are used to hold control settings for the Reference, Power

Control, ADC channel and PGA sections of the device. It is

not necessary that the contents of CRC through CRH on

each AD73360 are similar. Control registers are written to on

the negative edge of SCLK.

Table VI. Control Word Description

1514131211109876543210

C/D R/W DEVICE ADDRESSS REGISTER ADDRESS REGISTER DATA

Control Frame Description

Bit 15 Control/Data When set high, it signifies a control word in Program or Mixed Program/Data Modes. When set

low, it signifies an invalid control word in Program Mode.

Bit 14 Read/Write When set low, it tells the device that the data field is to be written to the register selected by the

selected register is to be written to the data field in the serial register and that the new control

word is to be output from the device via the serial output.

Bits 13–11 Device Address This 3-bit field holds the address information. Only when this field is zero is a device selected. If

the address is not zero, it is decremented and the control word is passed out of the device via the

serial output.

Bits 10–8 Register Address This 3-bit field is used to select one of the eight control registers on the AD73360.

Bits 7–0 Register Data This 8-bit field holds the data that is to be written to or read from the selected register provided

the address field is zero.

Table V. Control Register Map

Address (Binary) Name Description Type Width Reset Setting (Hex)

000 CRA Control Register A R/W 8 0x00

001 CRB Control Register B R/W 8 0x00

010 CRC Control Register C R/W 8 0x00

011 CRD Control Register D R/W 8 0x00

100 CRE Control Register E R/W 8 0x00

101 CRF Control Register F R/W 8 0x00

110 CRG Control Register G R/W 8 0x00

111 CRH Control Register H R/W 8 0x00