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Host Interface (HI08)
Table 6-12. Host Port Control Register (HPCR) Bit Definitions (Continued)
Bit Number
5
Bit Name
HAEN
Reset Value
0
Host Acknowledge Enable
Description
Controls the HACK signal. In the single host request mode (HDRQ is cleared
in the ICR), if HAEN and HREN are both set, HACK/HRRQ is configured as
the host acknowledge (HACK) input. If HAEN or HREN is cleared,
HACK/HRRQ is configured as a GPIO signal according to the value of the
HDDR and HDR. In the double host request mode (HDRQ is set in the ICR),
HAEN is ignored.
4
HREN
0
Host Request Enable
Controls the host request signals. If HREN is set and the HI08 is in the single
host request mode (that is, if HDRQ is cleared in the host interface control
register (ICR)), then HREQ/HTRQ is configured as the host request (HREQ)
output. If HREN is cleared, HREQ/HTRQ and HACK/HRRQ are configured
as GPIO signals according to the value of the HDDR and HDR.
If HREN is set in the double host request mode (that is, if HDRQ is set in the
ICR), HREQ/HTRQ is configured as the host transmit request (HTRQ) output
and HACK/HRRQ as the host receive request (HRRQ) output. If HREN is
cleared, HREQ/HTRQ and HACK/HRRQ are configured as GPIO signals
according to the value of the HDDR and HDR.
3
HCSEN
0
Host Chip Select Enable
If the HCSEN bit is set, HCS/HA10 is a host chip select (HCS) in the
non-multiplexed bus mode (that is, when HMUX is cleared) and host address
line 10 (HA10) in the multiplexed bus mode (that is, when HMUX is set). If
this bit is cleared, HCS/HA10 is configured as a GPIO signal according to the
value of the HDDR and HDR.
2
HA9EN
0
Host Address Line 9 Enable
If HA9EN is set and the HI08 is in multiplexed bus mode, then HA9/HA2 is
host address line 9 (HA9). If this bit is cleared and the HI08 is in multiplexed
bus mode, then HA9/HA2 is configured as a GPIO signal according to the
value of the HDDR and HDR.
NOTE: HA9EN is ignored when the HI08 is not in the multiplexed bus mode
(that is, when HMUX is cleared).
1
HA8EN
0
Host Address Line 8 Enable
If HA8EN is set and the HI08 is in multiplexed bus mode, then HA8/A1 is
host address line 8 (HA8). If this bit is cleared and the HI08 is in multiplexed
bus mode, then HA8/HA1 is a GPIO signal according to the value of the
HDDR and HDR.
NOTE: HA8EN is ignored when the HI08 is not in the multiplexed bus mode
(that is, when HMUX is cleared).
0
HGEN
0
Host GPIO Port Enable
Enables/disables signals configured as GPIO. If this bit is cleared, signals
configured as GPIO are disconnected: outputs are high impedance, inputs
are electrically disconnected. Signals configured as HI08 are not affected by
the value of HGEN.
DSP56311 User’s Manual, Rev. 2
6-18
Freescale Semiconductor
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