Motorola DSP56012 User Manual

Bits Used for DSP to Host Transfer

RXDF—RECEIVE D

A

T

A

 REGISTER FULL

1 = INDICA

TES 

THE RECIEVE BYTE REGISTERS (RXH, RXM, RXL)

CONT

AIN D

A

T

A

 FR

OM 

THE DSP

.

0 = CLEARED BY READING RXL.

HTDE—HOST 

TRANSMIT D

A

T

A

 EMPTY

1 = HO

TX IS EMPTY AND CAN BE 

WRITTEN BY DSP

.

0 = HO

TX IS FULL.

HTIE—HOST 

TRANSMIT INTERR

UPT ENABLE

1 = ENABLE 

THE DSP INTERR

UPT 

T

O

 P:$0032.

0 = DISABLE 

THE DSP INTERR

UPT 

T

O

 P:$0032.

DSP INTERR

UPT IS CA

USED BY HTDE = 1

RREQ —RECEIVE REQ

UEST ENABLE (USED 

T

O

 CONTR

OL 

THE HOREQ

 PIN)

1 = ENABLE INTERR

UPT REQ

UESTS CREA

TED BY RXDF

.

0 = DISABLE INTERR

UPT REQ

UESTS

.

$2

INTERRUPT 

STATUS

REGISTER (ISR)

(READ ONLY)

$0

X:$FFE8

HOST STATUS

REGISTER (HSR)

(READ ONLY)

HOST CONTROL

REGISTER (HCR)

(READ/WRITE)

INTERRUPT 

CONTROL

REGISTER (ICR)

(READ/WRITE)

X:$FFE8

HOREQ

HF3

HF2

TXDE

RXDF

70

0

DMA

6

5

432

1

TRDY

DMA

HF1

HF0

HTDE

HRDF

70

0

0

6

5

432

1

HCP

INIT

HF1

HF0

TREQ

RREQ

70

HM0

HM1

6

5

432

1

00

HF3

HF2

HTIE

HRIE

70

0

0

6

5

432

1

HCIE

MODES

AA0339