Motorola DSP56301 - Manual (Page 352)

Programming Sheets
B -40 DSP56301 User’s Manual
Figure B-28. Host Data Direction and Host Data Registers (HDDR, HDR)
Application: Date:
Programmer:
Sheet 1 of 4
GPIO
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
DR5 DR4 DR3 DR2 DR1 DR0 DR6 DR15 DR14 DR13 DR12 DR8 DR11 DR9 DR10
X:$FFFFC8 Write
Reset = $00
Host Data Direction Register (HDDR)
DRx = 0 → HIx is Input
DRx = 1 → HIx is Output
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
D5 D4 D3 D2 D1 D0 D6 D15 D14 D13 D12 D8 D11 D9 D10
X:$FFFFC9 Write
Reset = Undefined
Host Data Register (HDR)
DRx holds value of corresponding HI08 GPIO pin.
DR7
D7
Function depends on HDDR.
Port B (HI08)