DSP56857 datasheet(641/662 Pages) FREESCALE

tên linh kiện	DSP56857

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Sheet

56F853/854/855/857/858 Digital Signal Controller User Manual, Rev. 4

B-139

Freescale Semiconductor

Preliminary

3 of

HI8

HI8 Transmit Data Register (HTX)

Bits

Name

Description

15 - 0

HTX

HI8 Transmit Data Register

The write-only HI8 Transmit Data (HTX) register is used for DSC-to-Host data transfers. Writing

to the HTX register clears the HTDE bit in the HSR. The device can program the HTIE bit

causing a Host Transmit Data interrupt when the HTDE bit is set. The HTX register is transferred

as 16-bit data to the receive byte registers RXH/RXL when both the HTDE bit on the DSC Side

and the RXDF status bits on the Host Side are cleared. This transfer operation sets both RXDF

and HTDE bits. Data should not be written to the HTX register until the HTDE bit is set to prevent

the previous data from being overwritten.

HI8 Transmit Data

$1FFFD8 + $2

Bits

Read

Write

HIGH BYTE (FROM HRX)

LOW BYTE (FROM LRX)

Reset

000

denotes Reserved Bits

3 of 10

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