Motorola DragonBall MC9328MX1 Reference Manual page 768

Universal Asynchronous Receiver/Transmitters (UART) Modules
Table 27-16. UART1 Control Register 3 Description (Continued)
Name
AWAKEN Asynchronous WAKE Interrupt Enable—Controls
Bit 4 the asynchronous WAKE interrupt. An interrupt is
generated when AWAKEN is asserted and a falling
edge is detected on the RXD pin.
REF25 Reference Frequency 25 MHz—Indicates to the
Bit 3 hardware that a reference clock frequency of 25 MHz
is used. The reference clock is derived from the input
clock IPG_CLK via the programmable divider.
REF30 Reference Frequency 30 Mhz—Indicates to the
Bit 2 hardware that a reference clock frequency of 30 MHz
is used. The reference clock is derived from the input
clock IPG_CLK via the programmable divider.
INVT Inverted Infrared Transmission—Sets the active
Bit 1 level for the transmission. When INVT is cleared, the
infrared logic block transmits a positive IR 3/16 pulse
for all 0s and 0s are transmitted for 1s. When INVT is
set (INVT
active low or negative infrared 3/16 pulse for all 0s
and 1s are transmitted for 1s.
BPEN Preset Registers Enable—Activates the BRM
Bit 0 preset registers for use during automatic baud rate
detection mode. When BPEN is deasserted, the
remainder from the automatic baud count register
divided by 16 is ignored. When BPEN is asserted,
the remainder and the dividend chooses the
appropriate preset register on the detection of special
baud rates. If the criteria is not met for selecting one
of the preset registers, integer division is performed
by writing one less than the dividend to the
UBMR_1/UBMR_2 register.
27-32
Description
=
1), the infrared logic block transmits an
MC9328MX1 Reference Manual
Settings
0 = Disable the AWAKE interrupt
1 = Enable the AWAKE interrupt
0 = 25 MHz reference clock not used
1 = 25 MHz reference clock used
0 = 30 MHz reference clock not used
1 = 30 MHz reference clock used
0 = Active low transmission
1 = Active high transmission
0 = The BRM preset registers are not used
(normal operation)
1 = The BRM preset registers are used
(auto detect special baud rates)
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