DSP56857 datasheet(648/662 Pages) FREESCALE

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Date:

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Sheet

Appendix B - Programmer’s Sheets, Rev. 4

Freescale Semiconductor

B-146

Preliminary

HI8

10 of 10

Bits

Name

Description

7 - 0

TXH

Transmit Data High

This write-only register transmits data from the High Byte of the HRX register. It is selected by

three external Host Address (HA2, HA1, and HA0) inputs during a Host Processor write

operation or by an on-chip address counter in DMA operations. Data can be written into the

Transmit Data Registers when the TXDE bit is set. The Host Processor can program the TREQ

bit to assert the external HREQ pin when TXDE bit is set. This informs the Host Processor or

Host DMA controller the Transmit Byte Registers are empty. Writing the data register at Host

Address $7 clears the TXDE bit.

HI8 Transmit Byte Registers (TXH, TXL)

HI8 Transmit Byte

Registers

(TXH)

Base + $6/$7*

Bits

Read

Write

TXH

Reset

000

Bits

Name

Description

7 - 0

TXL

Transmit Data Low

This write-only register transmits data from the Low Byte of the HRX register. It is selected by

three external Host Address (HA2, HA1, and HA0) inputs during a Host Processor write

operation or by an on-chip address counter in DMA operations. Data can be written into the

Transmit Data Registers when the TXDE bit is set. The Host Processor can program the TREQ

bit to assert the external HREQ pin when TXDE bit is set. This informs the Host Processor or

Host DMA controller the Transmit Byte Registers are empty. Writing the data register at Host

Address $7 clears the TXDE bit.

HI8 Transmit Byte

Registers

(TXL)

Base + $7/$6*

Bits

Read

Write

TXL

Reset

000

denotes Reserved Bits

* Depends on HLEND setting

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