MC68CK331CAG16 Datasheet, PDF (55/84 Pages) Freescale Semiconductor, Inc – 32-Bit Modular Microcontroller

Freescale Semiconductor, Inc.
PORTQS — Port QS Data Register
$YFFC14
15
NOT USED
8
7
6
5
4
3
2
1
0
PQS7 PQS6 PQS5 PQS4 PQS3 PQS2 PQS1 PQS0
RESET:
0
0
0
0
0
0
0
0
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.
PQSPAR — PORT QS Pin Assignment Register
DDRQS — PORT QS Data Direction Register
$YFFC16
$YFFC17
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0 PQSPA6 PQSPA5 PQSPA4 PQSPA3 0 PQSPA1 PQSPA0 DDQS7 DDQS6 DDQS5 DDQS4 DDQS3 DDQS2 DDQS1 DDQS0
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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.
Table 23 QSPAR Pin Assignments
PQSPAR Field
PQSPA0
PQSPA1
PQSPA2
PQSPA3
PQSPA4
PQSPA5
PQSPA6
PQSPA7
PQSPAR Bit
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Pin Function
PQS0
MISO
PQS1
MOSI
PQS2¹
SCK
PQS3
PCS0/SS
PQS4
PCS1
PQS5
PCS2
PQS6
PCS3
PQS7²
TXD
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.
MC68331TS/D
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