dsp56824 Freescale Semiconductor, Inc, dsp56824 Datasheet - Page 35

• Manufacturer Part Number: dsp56824
• Description: 16-bit Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

A0–A15
No.
(Output)
(Output)
1.
2.
XCOLF/PB15.
85
86
87
Interrupt
(Input)
CLKO
GPIO
GPIO
Port B
(Input)
GPIO
In the formulas, T = 1/2 the clock cycle. For an internal frequency of 70 MHz, T = 7.14 ns.
If a 10 kW pullup or pulldown resistor is connected to XCOLF/PB15, add 3.9 ns for timings on
Port B interrupt pulse width
Port B interrupt assertion to external data memory access out
valid, caused by first instruction execution in the interrupt service
routine
Port B interrupt assertion to general purpose output valid, caused
by first instruction execution in the interrupt service routine
Fetch the instruction MOVE X0,X:(R0); X0 contains the new value of GPIO
and R0 contains the address of GPIO data register.
Figure 22. Port B Interrupt Timing (Negative-Edge-Sensitive)
Freescale Semiconductor, Inc.
82
For More Information On This Product,
Table 27. GPIO Timing (Continued)
Characteristics
Figure 21. GPIO Timing
DSP56824 Technical Data
Go to: www.freescale.com
VALID
85
84
83
Port B and C Pin GPIO Timing
19T + 9.6
31T + 10.
81
Min
4T
8
1
80
Max
—
—
—
1
AA0194
Unit
AA0195
ns
ns
ns
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