Host Interface (HI08)
Table 6-19. HI08 Programming Model, DSP Side (Continued)
Bit
Reset Type
Register
HPCR
Bit
No.
4
Bit
HREN
Name
Host Request
Value
HDRQ = 0
Function
HW/
SW
0
Indivi-
dual
STOP
cont.
Enable
0
HDRQ = 1
HREQ/HTRQ = GPIO
HREQ/HTRQ
1
HACK/HRRQ = GPIO
HREQ/HTRQ =
HREQ,HREQ/HTRQ
HACK/HRRQ = HTRQ, HRRQ
5
HAEN
Host
HDRQ = 0
0
Acknowledge
HDRQ=1
Enable
0
1
HACK/HRRQ = GPIO
HREQ/HTRQ
HACK/HRRQ = GPIO
HACK/HRRQ = HACK
HREQ/HTRQ
HACK/HRRQ = HTRQ, HRRQ
6
HEN
Host Enable
0
Host Port = GPIO
0
1
Host Port Active
8
7
HROD
Reserved
Host Request
0
0
Reserved
HREQ/HTRQ/HRRQ = driven
0
0
Open Drain
1
HREQ/HTRQ/HRRQ = open drain
9
HDSP
Host Data Strobe
0
HDS/HRD/HWR active low
0
Polarity
1
HDS/HRD/HWR active high
10
HASP
Host Address
0
HAS active low
0
Strobe Polarity
1
HAS active high
11
HMUX
Host Multiplexed
0
Separate address and data lines
0
Bus
1
Multiplexed address/data
12
HDDS
Host Dual Data
0
Single Data Strobe (HDS)
0
Strobe
1
Double Data Strobe (HWR, HRD)
13
HCSP
Host Chip Select
0
HCS active low
0
Polarity
1
HCS active high
14
HRP
Host Request
0
HREQ/HTRQ/HRRQ active low
0
Polarity
1
HREQ/HTRQ/HRRQ active high
15
HAP
Host
0
HACK active low
0
Acknowledge
Polarity
1
HACK active high
HSR
0
HRDF
Host Receive
0
no receive data to be read
0
0
0
Data Full
1
Receive Data Register is full
1
HTDE
Host Transmit
1
The Transmit Data Register is
1
1
1
Data Empty
0
empty.
The Transmit Data Register is not
empty.
2
HCP
Host Command
0
no host command pending
0
0
0
Pending
1
host command pending
3
4
HF0
HF1
Host Flag 0
Host Flag 1
0
0
DSP56311 User’s Manual, Rev. 2
6-30
Freescale Semiconductor
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