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HDI08 – DSP-Side Programmer’s Model
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
6-12 Freescale Semiconductor
6.5.5.2 HBAR Reserved Bits 8-15
These bits are reserved. They read as zero and should be written with zero for future compatibility.
Figure 6-5 Self Chip Select logic
6.5.6 Host Port Control Register (HPCR)
The HPCR is a 16-bit read/write control register used by the DSP to control the HDI08 operating mode.
The initialization values for the HPCR bits are described in Section 6.5.9, "DSP-Side Registers After
Reset". The HPCR bits are described in the following paragraphs.
NOTE
To assure proper operation of the HDI08, the HPCR bits HAP, HRP, HCSP,
HDDS, HMUX, HASP, HDSP, HROD, HAEN and HREN should be
changed only if HEN is cleared. Also, the HPCR bits HAP, HRP, HCSP,
HDDS, HMUX, HASP, HDSP, HROD, HAEN, HREN, HCSEN, HA9EN
and HA8EN should not be set when HEN is set or simultaneously with
setting HEN.
6.5.6.1 HPCR Host GPIO Port Enable (HGEN) Bit 0
If the HGEN bit is set, pins configured as GPIO are enabled. If this bit is cleared, pins configured as GPIO
are disconnected: outputs are high impedance, inputs are electrically disconnected. Pins configured as
HDI08 are not affected by the state of HGEN.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
HAP HRP HCSP HDDS HMUX HASP HDSP HROD HEN HAEN HREN HCSEN HA9EN HA8EN HGEN
- Reserved bit. Read as 0. Should be written with 0, for future compatibility.
Figure 6-6 Host Port Control Register (HPCR) (X:$FFFFC4)
Latch
HAD[0-7]
Chip select
COMPARATOR
A[3:7]
8 bits
HAS
HA[8:10]
DSP Peripheral
data bus
Base
Address
register
BA[3:7]