ia186xl Innovasic Semiconductor Inc., ia186xl Datasheet - Page 52

• Manufacturer Part Number: ia186xl
• Description: 16-bit Microcontroller
• Manufacturer: Innovasic Semiconductor Inc.

IA186XL/IA188XL
16-Bit Microcontrollers
6.
The IA186XL/IA188XL will perform a reset operation any time the resin_n pin is active.
Figure 21 shows the reset sequence when power is applied to the IA186XL/IA188XL. An
external clock connected to clkin must not exceed the V
processor. This is normally not a problem if the clock driver is supplied with the same V
supplies the processor. When attaching a crystal to the device, resin_n must remain active until
both V
startup characteristics of the crystal circuit). The resin_n pin is designed to operate correctly
using an RC reset circuit, but the designer must ensure that the ramp time for V
that resin_n is never really sampled at a logic low level when V
conditions.
Figure 22, Warm Reset Timing, shows the timing sequence when resin_n is applied after V
stable and the device has been operating. Any bus operation that is in progress at the time
resin_n is asserted will terminate immediately.
While resin_n is active, bus signals lock_n, a19/once_n, and a18–a16 are configured as inputs
and weakly held high by internal pull-up transistors. Only a19/ once_n can be overdriven to a
low-to-enable ONCE Mode.
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Note: Failure to assert resin_n while the device is powering up will result in
unpredictable operation.
Reset Operation
and clkout are stable (the length of time is application-specific and depends on the
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ENG211080711-01
Page 52 of 72
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threshold being applied to the
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Preliminary Data Sheet
September 30, 2008
http://www.Innovasic.com
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