![](http://datasheet.mmic.net.cn/290000/XPC801ZP25_datasheet_16187868/XPC801ZP25_382.png)
Serial Communication Modules
MOTOROLA
MPC801 USER’S MANUAL
16-11
16
TXAVEN—TX Available Enable
When it is high, this bit enables an interrupt as the transmitter makes a slot available in the
FIFO. When it is low, the TX AVAIL interrupt is disabled.
0 = TXAVEN interrupt is disabled.
1 = TXAVEN interrupt is enabled.
16.2.1.4.2 Baud Control Register.
generator and the GPIO pin.
This register controls the operation of the baud rate
GDEL—General-Purpose Input Delta
This bit indicates that a change occurred on the GPIO pin while the GPIO pin is used as an
input pin. If the GPIO interrupt is enabled, this bit posts an interrupt. This bit is cleared by
writing zero to clear the GPIO interrupt.
0 = GPIO pin has not been changed since it was last cleared.
1 = GPIO pin has been changed.
GPIO—General-Purpose Input/Output
This bit contains the current status of the GPIO pin. If GPIO is configured as an input, the
user can only read this bit. If it is configured as an output, this bit controls the pin.
0 = GPIO pin is low.
1 = GPIO pin is high.
GDIR—General-Purpose Input/Output Direction
This bit controls the direction of the GPIO pin. When it is high, the pin is an output. When it
is low, GPIO is an input.
0 = GPIO pin is an input.
1 = GPIO pin is an output.
GSRC—General-Purpose Input/Output Source
This bit controls the source of the GPIO pin. When it is high, the source is the 1
the baud rate generator. When it is low, the source is the GPIO bit. However, when the GPIO
is an input pin, this bit does not function.
×
clock from
0 = GPIO is driven by the GPIO bit.
1 = GPIO is driven by the bit clock from the baud generator.
BAUD CONTROL
BIT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
FIELD
GDEL
GPIO
G DIR
GSRC
BSRC
DIV
RESERVED
PRE
RESET
$003F