參數(shù)資料
型號(hào): MC68331CFC25B1
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 25 MHz, MICROCONTROLLER, PQFP132
封裝: 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132
文件頁數(shù): 52/90頁
文件大小: 481K
代理商: MC68331CFC25B1
MOTOROLA
MC68331
56
MC68331TS/D
DDRQS determines whether pins are inputs or outputs. Clearing a bit makes the corresponding pin an
input; setting a bit makes the pin an output. DDRQS affects both QSPI function and I/O function.
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 = 1), in which case it becomes
SCI serial output TXD.
DDRQS determines the direction of the TXD pin only when the SCI transmitter is disabled. When the
SCI transmitter is enabled, the TXD pin is an output.
5.4 QSPI Submodule
The QSPI submodule communicates with external devices through a synchronous serial bus. The QSPI
is fully compatible with the serial peripheral interface (SPI) systems found on other Motorola products.
A block diagram of the QSPI is shown below.
Table 24 Effect of DDRQS on QSM Pin Function
QSM Pin
Mode
DDRQS
Bit
State
Pin Function
MISO
Master
DDQ0
0
Serial Data Input to QSPI
1
Disables Data Input
Slave
0
Disables Data Output
1
Serial Data Output from QSPI
MOSI
Master
DDQ1
0
Disables Data Output
1
Serial Data Output from QSPI
Slave
0
Serial Data Input to QSPI
1
Disables Data Input
SCK1
Master
DDQ2
0
Disables Clock Output
1
Clock Output from QSPI
Slave
0
Clock Input to QSPI
1
Disables Clock Input
PCS0/SS
Master
DDQ3
0
Assertion Causes Mode Fault
1
Chip-Select Output
Slave
0
QSPI Slave Select Input
1
Disables Select Input
PCS[3:1]
Master
DDQ[4:6
]
0
Disables Chip-Select Output
1
Chip-Select Output
Slave
0
Inactive
1
Inactive
TXD2
Transmit
DDQ7
X
Serial Data Output from SCI
RXD
Receive
None
NA
Serial Data Input to SCI
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