Motorola DragonBall MC68328 User Manual page 100

All 8 bits are implemented in the registers, and each is connected to the outside. As with
other ports, each bit can be individually configured, as needed. The programmer's model for
port G is:
15 14 13 12
DIRECTION
DIR7 DIR6 DIR5 DIR4
Address: $FFFFF440
15 14 13 12
PU7 PU6 PU5 PU4
Address: $FFFFF442
DIRECTION- DIR[7:0]
These bits control the pin directions. While high, the pins are outputs; while low, the pins
are inputs. These bits reset to 0 and have no function while the SELECT bits are low.
DATA- D[7:0]
These bits control or report the data on the pins while the associated SELECT bits are
high. While the DIRECTION bits are high, the DATA bits control the pins. While the DI-
RECTION bits are low, the levels on the pins are reported. These bits reset to 0 while the
SELECT bits are low. The data bits may be written at any time. Bits that are configured
as inputs will accept the written data but it will not be accessible until the respective pins
MOTOROLA MC68328 DRAGONBALL PROCESSOR USER'S MANUAL
Table 7-5. Port K Bit Functions
Bit Port Function Other Function
0
1
2
3
4
5
6
7
11 10 9
DIR3 DIR2 DIR1
Figure 7-22. Port K Data/Direction Register
11 10 9
PULLUP
PU3 PU2 PU1
Figure 7-23. Port K Select Register
Bit 0 SPIM TXD
Bit 1 SPIM RXD
Bit 2 SPIM CLKO
Bit 3 SPIS EN
Bit 4 SPIS RXD
Bit 5 SPIS CLKI
Bit 6 PCMCIA CE2
Bit 7 PCMCIA CE1
8 7 6 5
DIR0 D7 D6 D5
8 7 6 5
PU0 SEL7 SEL6 SEL5
Parallel Ports
4 3 2 1
DATA
D4 D3 D2 D1
Reset Value: $0000
4 3 2 1
SELECT
SEL4 SEL3 SEL2 SEL1
Reset Value: $FFFF
0
D0
0
SEL0
7-13