CAM35C44 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
Manufacturer
CAM35C44 Datasheet PDF : 50 Pages
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Transmitter Auto Power Down
Ring Indicator Auto Power Down
The UART transmitter is powered down from the
auto power down state when the transmit buffer
and transmit shift registers are empty.
Receiver Auto Power Down
The UART receiver is powered down from the
auto power state when the receive FIFO is
empty and the receiver is waiting for a start bit.
When the UART is powered down from the auto
power state, a Ring Indicator interrupt can occur
on active transitions of the Ring Indicator input
nRI.
Exit Auto Power Down
The transmitter exits the auto power down state
on a write to the transmit buffer. The receiver
exits the auto power down state when the
receiver input RXD changes state.
TABLE 24 - ACE UART POWER STATES
ACE_ON
AUTO_PWR
(D1)
(D4)
DESCRIPTION
0
X
ACE POWER OFF
1
0
ACE POWER ON
1
1
ACE AUTO POWER DOWN
INT_OSC, Bit 5
The INT_ OSC bit D5 selects the clock source
for the CAM35C44 clock generator (see section
CLOCK GENERATOR on page 12).
When INT_OSC is “0” (default), the clock
generator is driven by an external clock source.
When INT_OSC is “1”, the clock generator is
driven by the internal crystal oscillator.
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