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DEMO9S08DZ60
Chapter 6 Parallel Input/Output Control
MC9S08DZ60 Series Data Sheet, Rev. 4
Freescale Semiconductor
101
6.5.4
Port D Registers
Port D is controlled by the registers listed below.
6.5.4.1
Port D Data Register (PTDD)
6.5.4.2
Port D Data Direction Register (PTDDD)
7
6
5
4
3
2
1
0
R
PTDD7
PTDD6
PTDD5
PTDD4
PTDD3
PTDD2
PTDD1
PTDD0
W
Reset:
0
0
0
0
0
0
0
0
Figure 6-24. Port D Data Register (PTDD)
Table 6-22. PTDD Register Field Descriptions
Field
Description
7:0
PTDD[7:0]
Port D Data Register Bits — For port D pins that are inputs, reads return the logic level on the pin. For port D
pins that are configured as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port D pins that are configured as outputs, the logic level is
driven out the corresponding MCU pin.
Reset forces PTDD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pull-ups/pull-downs disabled.
pins that are configured as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port D pins that are configured as outputs, the logic level is
driven out the corresponding MCU pin.
Reset forces PTDD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pull-ups/pull-downs disabled.
7
6
5
4
3
2
1
0
R
PTDDD7
PTDDD6
PTDDD5
PTDDD4
PTDDD3
PTDDD2
PTDDD1
PTDDD0
W
Reset:
0
0
0
0
0
0
0
0
Figure 6-25. Port D Data Direction Register (PTDDD)
Table 6-23. PTDDD Register Field Descriptions
Field
Description
7:0
PTDDD[7:0]
Data Direction for Port D Bits — These read/write bits control the direction of port D pins and what is read for
PTDD reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port D bit n and PTDD reads return the contents of PTDDn.
PTDD reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port D bit n and PTDD reads return the contents of PTDDn.