MC68332
REGISTER SUMMARY
USER’S MANUAL
D-25
DDRQS determines the direction of the TXD pin only when the SCI transmitter is dis-
abled. When the SCI transmitter is enabled, the TXD pin is an output.
D.4.10 SPCR0
— QSPI Control Register 0
$YFFC18
SPCR0 contains parameters for configuring the QSPI and enabling various modes of
operation. The CPU has read/write access to SPCR0, but the QSM has read access
only. SPCR0 must be initialized before QSPI operation begins. Writing a new value to
SPCR0 while the QSPI is enabled disrupts operation.
MSTR — Master/Slave Mode Select
0 = QSPI is a slave device.
1 = QSPI is system master.
NOTES:
1. PQS2 is a digital I/O pin unless the SPI is enabled (SPE in SPCR1 set), in which case it becomes
SPI serial clock SCK.
2. PQS7 is a digital I/O pin unless the SCI transmitter is enabled (TE in SCCR1 set), in which case
it becomes SCI serial output TXD.
Effect of DDRQS on QSM Pin Function
QSM Pin
Mode
DDRQS Bit
Bit
State
Pin Function
MISO
Master
DDQS0
0
Serial Data Input to QSPI
1
Disables Data Input
Slave
0
Disables Data Output
1
Serial Data Output from QSPI
MOSI
Master
DDQS1
0
Disables Data Output
1
Serial Data Output from QSPI
Slave
0
Serial Data Input to QSPI
1
Disables Data Input
SCK
1
Master
DDQS2
0
Disables Clock Output
1
Clock Output from QSPI
Slave
0
Clock Input to QSPI
1
Disables Clock Input
PCS0/SS
Master
DDQS3
0
Assertion Causes Mode Fault
1
Chip-Select Output
Slave
0
QSPI Slave Select Input
1
Disables Select Input
PCS[3:1]
Master
DDQS
0
Disables Chip-Select Output
[4:6]
1
Chip-Select Output
Slave
0
Inactive
1
Inactive
TXD
2
Transmit
DDQS7
X
Serial Data Output from SCI
RXD
Receive
None
NA
Serial Data Input to SCI
15
14
13
10
9
8
7
0
MSTR
WOMQ
BITS
CPOL
CPHA
SP
RESET:
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
.
..