CDC3205G-C Micronas, CDC3205G-C Datasheet - Page 203

• Manufacturer Part Number: CDC3205G-C
• Description: Automotive Controller Family The Device is a Microcontroller For Use in Automotive Applications.the On-chip Cpu is an Arm Processor ARM7TDMI with 32-bit Data And Address Bus, Which Supports Thumb format Instructions.
• Manufacturer: Micronas

PRELIMINARY DATA SHEET
The current amplitude value can’t be read out). The new
gong sound will start immediately with a low cycle of F
30.1.5. Stop Gong
The gong sound will stop automatically as soon as the ampli-
tude value in AMAS reaches zero. This will reset the AMA,
which indicates the inactive audio module.
Fig. 30–3:
30.1.6. Decay of Sound
The decay characteristic used for this gong sound is
described by the following exponential function:
with
Following the above formula, n can be expressed as
Micronas
Conditions: (F
F
time
Output
Gong
Decrement
Pin
A
A
A
n = int (t * F
start gong
n
0
n
zoomed
gong
output
signal
= initial amplitude (AMAS)
= amplitude after n F
= number of decrement cycles
0 s
A
F
Example sections of the audio module output signal
0
Gong
(1 -
PWM
1
/
Decrement
= 15.625 kHz; F
32
n
)
C
A
B
n
4 x A
------------------------------ -
ln
ln
A
100 %
15 %
n
50 %
PWM
Pulse
Duty
Factor
1
new amplitude (n.a.)
)
–
–
Decrement
ln
----- -
32
1
A
0
after 0.146 s (0.68
after 0.398 s (1.87
after 0 s (initial)
Gong
cycles
= 601 Hz; AMDEC value = 2, F
n.a.
0.146 s (0.68
June 12, 2003; 6251-579-1PD
Gong
0
.
1
4 x B
2
To stop the gong sound, just write 0x00 into AMAS. The gong
sound then will stop immediately with the writing of 0x00
(also indicated by AMA).
A continuous tone will never stop automatically. It has to be
stopped by writing 0x00 into AMAS.
Each F
F
AMDEC and by F
With GDF settings of 6 and 7 the gong sound amplitude
update frequency F
The time constant
defined as the time interval within which the amplitude A is
decreasing to 36.8%.
3
Decrement
F
Decrement
Decrement
Decrement
12 13
n.a.
is determined by the value of GDF in the register
F
Gong
= 150.25Hz)
F
PWM
cycle the amplitude is decreased by 1/32.
14
Gong
Decrement
=
15
n.a.
0.398 s (1.87
:
of the above exponential function is
F
---------------------
2
GONG
GDF
is zero (continuous tone).
CDC 32xxG-C
4 x C
25
GDF
26
=
0
5
n.a.
201