User`s manual

Am186
TM
CC Microcontroller ISDN TA Reference Design Manual
2-13
The reset circuit consists of a push button, a diode, and an RC circuit used to provide
a time delay. The reset circuit is shown in Figure 2-9. The RES
signal into the
Am186CC microcontroller must be held Low for at least 1 ms to allow the internal
circuitry to settle. The Am186CC microcontroller begins fetching instructions
6.5 CLKOUT periods after RES
is deasserted.
Figure 2-9. ISDN TA Power Supply and Reset Circuit
CAUTION: If using your own power supply, ensure that it is a
5-V supply. Using a 9-V or 12-V supply will permanently damage
the board.
VCC5
VCC3
CR5
LED RT GREEN
12
SW1
SW SPDT C+K 7101
2
1
3
F2
750mA
+
C56
10uF
16V
C-CASE
U15
LDO 3.3
Micrel MIC5209-3.3BS
1 3
2 4
IN OUT
GND TAB
SW2
Reset Switch
1 3
P4
BARREL CON
2
1
3
SHUNT
CENTER
SLEEVE
R31
100K
R32
270
R52
0
C59
0.1uF
+
C55
10uF
16V
C-CASE
D2
2 3
RES#
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