参数资料
型号: MC68331CFC16B1
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
封装: 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132
文件页数: 51/90页
文件大小: 481K
代理商: MC68331CFC16B1
MC68331
MOTOROLA
MC68331TS/D
55
PORTQS latches I/O data. Writes drive pins defined as outputs. Reads return data present on the pins.
To avoid driving undefined data, first write a byte to PORTQS, then configure DDRQS.
Clearing a bit in the PQSPAR assigns the corresponding pin to general-purpose I/O; setting a bit as-
signs the pin to the QSPI. The PQSPAR does not affect operation of the SCI.
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 be-
comes SCI serial output TXD.
PORTQS — Port QS Data Register
$YFFC14
15
8
7
6
5
4
3
2
1
0
NOT USED
PQS7
PQS6
PQS5
PQS4
PQS3
PQS2
PQS1
PQS0
RESET:
0
PQSPAR — PORT QS Pin Assignment Register
$YFFC16
DDRQS — PORT QS Data Direction Register
$YFFC17
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PQSPA6 PQSPA5 PQSPA4 PQSPA3
0
PQSPA1 PQSPA0
DDQS7 DDQS6 DDQS5 DDQS4 DDQS3 DDQS2 DDQS1 DDQS0
RESET:
0
Table 23 QSPAR Pin Assignments
PQSPAR Field
PQSPAR Bit
Pin Function
PQSPA0
0
1
PQS0
MISO
PQSPA1
0
1
PQS1
MOSI
PQSPA2
0
1
PQS21
SCK
PQSPA3
0
1
PQS3
PCS0/SS
PQSPA4
0
1
PQS4
PCS1
PQSPA5
0
1
PQS5
PCS2
PQSPA6
0
1
PQS6
PCS3
PQSPA7
0
1
PQS72
TXD
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