21
CHIPRES
Meaning:
Chip Reset
Mode: Peripheral
and
Host
The CPU sets this bit to reset the chip. Its effect is identical to driving the RES# pin low.
The CPU clears this bit to take the chip out of reset.
Programming Notes
The CPU can clear this bit immediately after setting it. Resetting the MAX3421E either at power
on or by setting the CHIPRES bit clears most register bits, including the HOST bit, and therefore
sets up the MAX3421E to operate as a USB peripheral device.
Setting CHIPRES = 1 stops the internal oscillator.
After removing the reset by setting
CHIPRES = 0, the CPU should check the OSCOK interrupt request. The CPU should proceed
only after this interrupt asserts, an indication that the oscillator and PLL have stabilized.