mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 123

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

Port G is controlled by the registers listed below.
6.5.7.1
6.5.7.2
Freescale Semiconductor
Reset:
Reset:
PTGDDn
PTGDn
•
•
Field
Field
6–0
6–0
W
W
R
R
PTG5 shares its pin with XTAL.
PTG6 shares its pin with EXTAL.
Port G Data Register Bits — For port G pins that are inputs, reads return the logic level on the pin. For port G
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 G pins that are configured as outputs, the logic level is
driven out the corresponding MCU pin.
Reset forces PTGD 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 G Bits — These read/write bits control the direction of port G pins and what is read for
PTGD reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port G bit n and PTGD reads return the contents of PTGDn.
Port G Data Register (PTGD)
0
0
Port G Data Direction Register (PTGDD)
0
0
7
7
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
PTGDD6
PTGD6
0
0
6
6
Figure 6-33. Port G Data Direction Register (PTGDD)
Table 6-32. PTGDD Register Field Descriptions
Table 6-31. PTGD Register Field Descriptions
Figure 6-32. Port G Data Register (PTGD)
PTGDD5
PTGD5
0
0
5
5
PTGDD4
PTGD4
0
0
4
4
Description
Description
PTGDD3
PTGD3
3
0
3
0
PTGDD2
PTGD2
0
0
2
2
Parallel Input/Output Control
PTGDD1
PTGD1
0
0
1
1
PTGDD0
PTGD0
0
0
0
0
6-19