MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 472

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

14.6.1 Port QS Data Register (PORTQS)
MPC555
USER’S MANUAL
DDRQS does not affect SCI pin function. TXDx pins are always outputs, and RXDx
pins are always inputs, regardless of whether they are functioning as SCI pins or as
PORTQS pins.
The port QS data register (PORTQS) latches I/O data. PORTQS writes drive pins de-
fined as outputs. PORTQS reads return data present on the pins. To avoid driving un-
defined data, write the first data to PORTQS before configuring DDRQS.
PORTQS determines the actual input or output value of a QSMCM port pin if the pin
is defined as general-purpose input or output. All QSMCM pins except the ECK pin can
be used as general-purpose input and/or output. When the SCIx transmitter is dis-
abled, TXDx is a discrete output; when the SCIx receiver is disabled, RXDx is a dis-
crete input. Writes to this register affect the pins defined as outputs; reads of this
register return the actual value of the pins.
/
MPC556
QSMCM Pin
PCS[0]/SS
NOTES:
PCS[1:3]
MISO
MOSI
SCK
1. SCK/QGPIO6 is a digital I/O pin unless the SPI is enabled (SPE set in SPCR1), in which
case it becomes the QSPI serial clock SCK.
1
Table 14-8 Effect of DDRQS on QSPI Pin Function
Master
Master
Master
Master
Master
Mode
Slave
Slave
Slave
Slave
Slave
QUEUED SERIAL MULTI-CHANNEL MODULE
DDRQS Bit
DDQS[4:6]
DDQS0
DDQS1
DDQS2
DDQS3
Rev. 15 October 2000
Bit State
—
—
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Serial data output from QSPI
Serial data output from QSPI
Assertion causes mode fault
Disables chip-select output
Disables slave select input
Serial data input to QSPI
Serial data input to QSPI
Clock output from QSPI
QSPI slave select input
Disables data output
Disables data output
Clock input to QSPI
Disables data input
Disables data input
Chip-select output
Chip-select output
Pin Function
Inactive
Inactive
MOTOROLA
14-10