Stereo System User Manual

Parallel Host Interface

Host Interface (HI)

MOTOROLA DSP56012 User’s Manual 4-43

Figure 4-19 HI Initialization—DSP Side

X:$FFE8

Host Control Register (HCR)

(Read/Write)

6.Select Port B For HI Port Operation:

X:$FFEC

Reserved; write as 0.

Note: 1. The host flags are general-purpose semaphores. They are not required for host

port operation but can be used in some applications.

STEP 1 of HI Port Configuration

1.Enable/Disable

Host Receive Data Full Interrupt

Enable Interrupt:Bit 0 = 1

Disable Interrupt:Bit 0 = 0

2.Enable/Disable

Host Transmit Data Empty Interrupt

Enable Interrupt: Bit 1 = 1

Disable Interrupt: Bit 1 = 0

3.Enable/Disable

Host Command Pending Interrupt

Enable Interrupt: Bit 2 = 1

Disable Interrupt: Bit 2 = 0

4.Set/Clear

Host Flag 2 (Optional)

Enable Flag: Bit 3 = 1

Disable Flag: Bit 3 = 0

5.Set/Clear

Host Flag 3 (Optional)

Enable Flag: Bit 4 = 1

Disable Flag: Bit 4 = 0

HF3 HF2 HCIE HTIE HRIE

15 0

65 4 3 21

AA0327