SPSB081 datasheet(49/137 Pages) STMICROELECTRONICS

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ROM address

Description

Access

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

01H

→

01H

00H

→

00H

4.3.1.1

Device identification registers

These registers represent a unique signature to identify the device and silicon version.

<Company Code>: 00H (STMicroelectronics)

<Device Family>: 01H (BCD power management)

<Device No. 1>: 55H (ASCII code for U)

<Device No. 2>: 52H (ASCII code for R)

<Device No. 3>: 37H (ASCII code for 7)

<Device No. 4>: 50H (ASCII code for P)

4.3.1.2

SPI modes

By reading out the <SPI mode> register general information of SPI usage of the device application registers can

be read.

Table 20. SPI mode register

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DL2

DL1

DL0

<SPI mode>: B0H (burst mode read available, 32 bit, no data consistency check).

4.3.1.3

SPI burst read

Table 21. Burst read bit

Bit 7

Description

BR not available

BR available

The SPI burst read bit indicates if a burst read operation is implemented. The intention of a burst read is, for

example, used to perform a device internal memory dump to the SPI master.

The start of the burst read is like a normal read operation. The difference is, that after the SPI data length the

CSN is not pulled high and the SCK is continuously clocked. When the normal SCK max count is reached (SPI

data length), the consecutive addressed data is latched into the shift register. This procedure is performed every

time when the SCK payload length is reached.

In case the automatically incremented address is not used by the device, undefined data is shifted out. An

automatic address overflow is implemented when address 3FH is reached.

The SPI burst read is limited by the CSN low timeout.

4.3.1.4

SPI data length

The SPI data length value indicates the length of the SCK count monitor, which is running for all accesses to the

device application registers. In case a communication frame with an SCK count is not equal to the reported one, it

leads to a SPI error and the data are rejected.

SPSB081

Address definition

DS14048 - Rev 3

page 49/137

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