Specifications

System Functions
 DSP56800 Hardware Interface Techniques 9
2.4.3 GPIO Pin Configured as Interrupt Interface
An example interface to GPIO pins found on the DSP56800 device is shown in Figure 11. These
inputs can be configured as interrupt sources or as general-purpose I/O’s as described further in the
device User’s Manuals.
Figure 11. Run/Stop and General Purpose Switches
2.5 JTAG/OnCE Interface
Figure 12 shows a parallel interface to the DSP56800 JTAG/OnCE port. When using the parallel
JTAG interface, the jumper should be removed. Further information on the OnCE port follows.
Figure 12. Block Diagram of the Parallel JTAG Interface
DSP56F807
+3.3V
PD3
PD4
PD5
+3.3V
10K
10K
10K
GP #1 SWITCH
GP #2 SWITCH
START/STOP SWITCH
+3.3V
DB-25 Connector
Parallel JTAG Interface
DSP56F800
TDI
TDO
P_TRST
TMS
TCK
P_RESET
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
EN
TDI
TDO
TRST
TMS
TCK
RESET
JG4
1
2
+3.3V
Jumper Removed:
Enable JTAG I/F
Jumper Pin 1-2:
Disable JTAG I/F
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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