DEMO9S08LIN Freescale, DEMO9S08LIN Datasheet - Page 91

• Manufacturer Part Number: DEMO9S08LIN
• Manufacturer: Freescale

Specifications of DEMO9S08LIN

• Lead Free Status / RoHS Status: Compliant

1
2
1
2
6.2.5.1
Port C parallel I/O function is controlled by the data and data direction registers in this section.
6.2.5.2
6.2.6
Associated with the parallel I/O ports is a set of registers located in the high page register space that operate
independently of the parallel I/O registers. These registers are used to control pullups, slew rate, and drive
Freescale Semiconductor
PTCDD[7:0]
Reads of PTCD7 always return the pin value of PTC7, regardless of the value stored in the bit PTCDD7
Reads of PTCD6 always return the contents of PTCD6, regardless of the value stored in the bit PTCDD6.
PTCDD7 has no effect on the input-only PTC7 pin.
PTCDD6 has no effect on the output-only PTC6 pin
PTCD[7:0]
Reset
Reset
Field
Field
7:0
7:0
W
W
R
R
PTCDD7
PTCD7
Port C Control Registers
Port C Data Registers (PTCD)
Port C Data Direction Registers (PTCDD)
Port C Data Register Bits — For port C pins that are inputs, reads return the logic level on the pin. For port C
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 C pins that are configured as outputs, the logic level is
driven out the corresponding MCU pin.
Reset forces PTCD 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 C Bits — These read/write bits control the direction of port C pins and what is read for
PTCD reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port C bit n and PTCD reads return the contents of PTCDn.
0
0
7
7
1
1
PTCDD6
PTCD6
0
0
6
6
MC9S08LC60 Series Data Sheet: Technical Data, Rev. 4
2
2
Figure 6-21. Data Direction for Port C (PTCDD)
Figure 6-18. Port C Data Register (PTCD)
Table 6-12. PTCDD Field Descriptions
Table 6-11. PTCD Field Descriptions
PTCDD5
PTCD5
0
0
5
5
PTCDD4
PTCD4
0
0
4
4
Description
Description
PTCDD3
PTCD3
3
0
3
0
PTCDD2
PTCD2
0
0
2
2
Chapter 6 Parallel Input/Output
PTCDD1
PTCD1
0
0
1
1
PTCDD0
PTCD0
0
0
0
0
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