mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 128

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

Parallel Input/Output Control
6.5.9.1
6.5.9.2
6.5.9.3
6-24
Reset:
Reset:
Reset:
PTJDDn
PTJDn
Field
Field
7–0
7–0
W
W
W
R
R
R
PTJDD7
PTJPE7
PTJD7
Port J Data Register Bits — For port J pins that are inputs, reads return the logic level on the pin. For port J
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 J pins that are configured as outputs, the logic level is
driven out the corresponding MCU pin.
Reset forces PTJD 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 disabled.
Data Direction for Port J Bits — These read/write bits control the direction of port J pins and what is read for
PTJD reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port J bit n and PTJD reads return the contents of PTJDn.
Port J Data Register (PTJD)
0
Port J Data Direction Register (PTJDD)
0
Port J Pull Enable Register (PTJPE)
0
7
7
7
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
PTJDD6
PTJPE6
Figure 6-44. Internal Pull Enable for Port J Register (PTJPE)
PTJD6
0
0
0
6
6
6
Figure 6-43. Port J Data Direction Register (PTJDD)
Table 6-42. PTJDD Register Field Descriptions
Table 6-41. PTJD Register Field Descriptions
Figure 6-42. Port J Data Register (PTJD)
PTJDD5
PTJPE5
PTJD5
0
0
0
5
5
5
PTJDD4
PTJPE4
PTJD4
0
0
0
4
4
4
Description
Description
PTJDD3
PTJPE3
PTJD3
3
0
3
0
3
0
PTJDD2
PTJPE2
PTJD2
0
0
0
2
2
2
PTJDD1
PTJPE1
Freescale Semiconductor
PTJD1
0
0
0
1
1
1
PTJDD0
PTJPE0
PTJD0
0
0
0
0
0
0