Stereo System User Manual

Programming Reference
MOTOROLA DSP56012 User’s Manual B-19
HI
Sheet 1 of 5
Application:
Date:
Programmer:
Port B
15
PBC1 PBC0
65432101098714 13 12 1123
* = Reserved, write as 0
• • •
PBC1 PBC0 Function
0 0 General Purpose I/O (Reset Condition)
0 1 Host Interface
1 0 Host Interface (with HACK Pin as GPIO)
1 1 Reserved
Port B
Control Register
X:$FFEC Read/Write
Reset = $000000
Port B Control Register (PBC)
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
*
0
$0 $0 $0
(PBC)
Host Control Register (HCR)
HTIEHCIE HRIEHF3 HF2
6543210723
* = Reserved, write as 0
• • •
*
0
*
0
*
0
*
0
Host Control Register (HCR)
X:$FFE8 Read/Write
Reset = $00
Host Receive Interrupt Enable (HRIE)
0 = disable/1 = enable — interrupt on HRDF
Host Transmit Interrupt Enable (HTIE)
0 = disable/1 = enable — interrupt on HTDE
Host Command Interrupt Enable (HCIE)
0 = disable/1 = enable — interrupt on HCP
Host Flags (HF3, HF2)
general purpose read/write flags
DSP Side