co661al-s Connect One Ltd., co661al-s Datasheet - Page 21

• Manufacturer Part Number: co661al-s
• Description: The Co661al-s Ichip? Internet Controller? Is Part Of A Family Of Intelligent Peripheral Devices That Provides Internet Connectivity Solutions To A Myriad Of Embedded Devices.
• Manufacturer: Connect One Ltd.

5.2.2 Miscellaneous Signals
MMSEL
-RES
X1
X2
iChip CO661AL-S Datasheet
Signal
Type
O
I
I
I
Pin No.
64
12
42
43
Modem Mode Select:
RESET: When -RES is LOW, iChip immediately
terminates its present activity and clears its internal
logic.
-RES must be held LOW for at least 1 mSec after
power achieves 90% VCC.
facilitate power-on reset generation via an RC network
(see
Crystal Input: This pin and the X2 pin provide
connections for a fundamental mode or third-overtone,
parallel-resonant crystal used by the internal oscillator
circuit.
To provide iChip with an external clock source,
connect the source to the X1 pin and leave the X2 pin
unconnected.
Crystal Output: This pin and the X1 pin provide
connections for a fundamental mode or third-overtone,
parallel-resonant crystal used by the internal oscillator
circuit.
This input is provided with a Schmidt trigger to
• When this pin is held LOW during power up for at
• During a firmware update procedure, when an
• When this pin is held LOW during power up for
least 5 seconds, iChip will automatically enter
firmware update mode.
external modem dials to the iChip, pulling this pin
down to LOW will cause the iChip to immediately
answer the call and begin the update session.
less than 5 seconds, it forces iChip into auto baud
rate detection.
Fig.
7-4).
Description
Pin Descriptions
5-4