DSP56156 Motorola Inc, DSP56156 Datasheet - Page 67

• Manufacturer Part Number: DSP56156
• Description: 16-bit Digital Signal Processor
• Manufacturer: Motorola Inc

62
Design Considerations
Power Consumption
Power Consumption
(V
The DC electrical characteristics of this device are shown in Table 27. Power consumption is
application dependant. The data in Table 27 is collected by running the following code using
internal memory after having programmed all pins of port B and C as input and after having
three-stated the data bus (MC = 0 in OMR) and pulled high:
loop
To minimize the power dissipation, all unused digital input pins should be tied inactive to
ground or power; and all unused I/O pins should be tied inactive through a 10K¾ resistor to
ground or power. When the codec is not used, GNDA should be connected to GND; and V
should be connected to V
should still be decoupled.
CC
Digital current with Codec and PLL disabled
Digital current Wait Mode with Codec
and PLL disabled
Digital current Wait Mode with Codec Enabled
and PLL disabled
Stop mode with PLL and CLKO disabled
Digital current drawn by the PLL when active
Digital current drawn by CLKO when active
Analog current with Codec enabled
Analog current with Codec disabled
= 5.0 V dc ± 10%, T
move
move
move
move
clr
move
move
rep
mac
move
move
jmp
Conditions
#0,r0
#0,r3
#$100,r2
#$00ff,m0
a
x:(r0)+,a
a1,a0
#30
x0,y0,a
a,p:(r2)
#0,r3
loop
J
= -40 to +125 C, C
Freescale Semiconductor, Inc.
CC
Table 27 DC Electrical Characteristics
For More Information On This Product,
. Also, all codec pins should be left floating, except VREF which
DSP56156 Data Sheet
x:(r3)+,x0
Go to: www.freescale.com
L
= 50 pF + 1 TTL Load)
Symbol
;initial value to accumulator
;mac on typical data
;store the mac result
I
I
I
I
I
I
I
I
CC
CC
CC
CC
CC
CC
CCA
CCA
MHz
40
91
12
92
—
—
—
—
—
Typical
MHz
250
112
113
3.6
50
12
70
14
1
MHz
133
134
60
17
—
—
—
—
—
MOTOROLA
Unit
mA
mA
mA
mA
mA
mA
µA
µA
CCA