UPD9993 datasheet(47/102 Pages) RENESAS

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µ PD9993

Data Sheet S17306EJ2V0DS

7.3.9 HIO status register (HIO1)

This is the status register for the internal DSP interface (HIO).

Address: 42H, register name: HIO1, block: DSP, access: R/W

HRER

HWER

HSER

HLER

HREF

HWEF

(1) HRER (Error flag of host read)

Data

Mode

Initial Value

Description

–

Error occurred

A host read error occurred.

Caution

This register is set to "1" when the host CPU reads HDT and HREF = 0.

Once it is set to "1", this register will not change until the DSP writes "0" to it.

(2) HWER (Error flag of host write)

Data

Mode

Initial Value

Description

–

Error occurred

A host write error occurred.

Caution

This register is set to "1" when the host CPU writes to HDT and HWEF = 0.

Once it is set to "1", this register will not change until the DSP writes "0" to it.

(3) HSER (Error flag of HDT store)

Data

Mode

Initial Value

Description

–

Error occurred

An HDT store error occurred

Caution

This register is set to "1" when the DSP stores data in HDT and HREF = 1.

Once it is set to "1", this register will not change until the DSP writes "0" to it.

(4) HLER (Error flag of HDT load)

Data

Mode

Initial Value

Description

–

An HDT load error occurred

Caution

This register is set to "1" when the DSP loads data from HDT and HWEF = 1.

Once it is set to "1", this register will not change until the DSP writes "0" to it.

(5) HREF (Enabling flag of Host read)

Data

Mode

Initial Value

Description

Disable

Disables reading from host CPU.

Enable

Enables reading from host CPU.

Caution

This register is set to "1" when the DSP stores data in HDT.

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