External Signals
2-8
MPC801
USER’S MANUAL
MOTOROLA
2
PB[29]
SPIMOSI
G15
General-Purpose I/O Port B Bit 29
SPIMOSI
—This is the serial peripheral interface output data when it is configured as a master or serial
peripheral interface input data when it is configured as a slave.
—This is Bit 29 of the general-purpose I/O port B.
PB[28]
SPIMISO
G16
General-Purpose I/O Port B Bit 28
SPIMISO
—This is the serial peripheral interface input data when it is configured as a master or serial
peripheral interface output data when it is configured as a slave.
—This is Bit 28 of the general-purpose I/O port B.
PB[27]
I2CSDA
H14
General-Purpose I/O Port B Bit 27
—This is Bit 27 of the general-purpose I/O port B.
I2CSDA
output.
—This is the I
2
C serial data pin. It is bidirectional and should be configured as an open-drain
PB[26]
I2CSCL
H15
General-Purpose I/O Port B Bit 26
—This is Bit 26 of the general-purpose I/O port B.
I2CSCL
output.
—This is the I
2
C serial clock pin. It is bidirectional and should be configured as an open-drain
PB[25]
UGPIO1
J13
General-Purpose I/O Port B Bit 25
UGPIO1
—This is the general-purpose input/output pin of UART1. It can be configured as a general
input or output or it can serve as the source of the clock to the baud rate generator. It can also output
the bit clock at the selected baud rate.
—This is Bit 25 of the general-purpose I/O port B.
PB[24]
UGPIO2
J15
General-Purpose I/O Port B Bit 24
UGPIO2
—This is the general-purpose input/output pin of UART2. It can be configured as a general
input or output or it can serve as the source of the clock to the baud rate generator. It can also output
the bit clock at the selected baud rate.
—This is Bit 24 of the general-purpose I/O port B.
PB[23]
UCTS1
K16
General-Purpose I/O Port B Bit 23
UCTS1
—This is an active low clear-to-send input of UART1 that is used to control the transmitter.
—This is Bit 23 of the general-purpose I/O port B.
PB[22]
UCTS2
K15
General-Purpose I/O Port B Bit 22—
UCTS2
—This is an active low clear-to-send input of UART2 that is used to control the transmitter.
This is Bit 22 of the general-purpose I/O port B.
PB[21]
URXD1
K14
General-Purpose I/O Port B Bit 21
URXD1
—This signal is the receive data serial input of UART1.
—This is Bit 21 of the general-purpose I/O port B.
PB[20]
URXD2
L16
General-Purpose I/O Port B Bit 20
URXD2
—This signal is the receive data serial input of UART2.
—This is Bit 20 of the general-purpose I/O port B.
PB[19]
URTS1
L15
General-Purpose I/O Port B Bit 19
URTS1
—This is an active low ready-to-send output from UART1 used to indicate that the receiver is
ready.
—This is Bit 19 of the general-purpose I/O port B.
PB[18]
URTS2
L14
General-Purpose I/O Port B Bit 18
—This is Bit 18 of the general-purpose I/O port B.
URTS2
—This is an active low ready-to-send output from UART2 used to indicate that the receiver is
ready.
PB[17]
UTXD1
M16
General-Purpose I/O Port B Bit 17
—This is Bit 17 of the general-purpose I/O port B.
UTXD1
—This signal is the transmit data serial output from UART1.
PB[16]
UTXD2
M15
General-Purpose I/O Port B Bit 16
—This is Bit 16 of the general-purpose I/O port B.
UTXD2
—This signal is the transmit data serial output from UART1.
Table 2-1. Signal Descriptions (Continued)
PIN NAME
PIN NUMBER
DESCRIPTION