mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 116

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Parallel Input/Output Control
6.5.4.1
6.5.4.2
6.5.4.3
6-12
Reset:
Reset:
Reset:
PTDDDn
PTDDn
Field
Field
7–0
7–0
W
W
W
R
R
R
PTDDD7
PTDPE7
PTDD7
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 pullups/pulldowns disabled.
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.
Port D Data Register (PTDD)
0
Port D Data Direction Register (PTDDD)
0
Port D Pull Enable Register (PTDPE)
0
7
7
7
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
PTDDD6
PTDPE6
Figure 6-19. Internal Pull Enable for Port D Register (PTDPE)
PTDD6
0
0
0
6
6
6
Figure 6-18. Port D Data Direction Register (PTDDD)
Table 6-17. PTDDD Register Field Descriptions
Table 6-16. PTDD Register Field Descriptions
Figure 6-17. Port D Data Register (PTDD)
PTDDD5
PTDPE5
PTDD5
0
0
0
5
5
5
PTDDD4
PTDPE4
PTDD4
0
0
0
4
4
4
Description
Description
PTDDD3
PTDPE3
PTDD3
3
0
3
0
3
0
PTDDD2
PTDPE2
PTDD2
0
0
0
2
2
2
PTDDD1
PTDPE1
Freescale Semiconductor
PTDD1
0
0
0
1
1
1
PTDDD0
PTDPE0
PTDD0
0
0
0
0
0
0