co661al-d Connect One Ltd., co661al-d Datasheet - Page 22

• Manufacturer Part Number: co661al-d
• Description: Co661al-d Ichip Plus? 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
-RES
X1
X2
CLKO/HBT/Z6
-SER/PAR
iChip Plus CO661AL-D Datasheet
Signal
Type
O
O
I
I
I
Pin No.
12
42
43
44
55
RESET: When -RES is LOW, iChip Plus
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.
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 Plus 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.
AT+i Configurable Pin:
CLKO (default): Clock Output. This pin provides
a clock-out to the system at the same frequency as
X1. During reset the clock out is disabled.
HBT: Heart Beat. Provides a 50% duty cycle, 40
mSec frequency square wave, when iChip F/W is
properly running. (Available from iChip Plus
Firmware ver. 7.04).
In the future it may be changed to a GPIO.
This pin is configurable with the AT+iPN44
command (see AT+i Programmers Manual).
Serial/Parallel mode select. This pin is sampled
on the rising edge of the –RES signal. If it is
LOW, iChip Plus functions in Serial mode.
Otherwise it functions in Parallel mode.
This input is provided with a Schmidt trigger to
Description
Pin Descriptions
5-4