mc9s08ac16 Freescale Semiconductor, Inc, mc9s08ac16 Datasheet - Page 95

• Manufacturer Part Number: mc9s08ac16
• Description: Hcs08 Microcontrollers 8-bit Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

1
1
6.7.5
Port C parallel I/O function is controlled by the registers listed below.
Freescale Semiconductor
PTCDD[5:0]
Bit 6 is a reserved bit that must always be written to 0.
Bit 6 is a reserved bit that must always be written to 0.
PTCD[5:0]
Reset
Reset
Field
Field
5:0
5:0
W
W
R
R
Port C I/O Registers (PTCD and 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
0
0
7
7
R
R
0
0
6
6
Figure 6-21. Data Direction for Port C (PTCDD)
Table 6-12. PTCDD Register Field Descriptions
Table 6-11. PTCD Register Field Descriptions
Figure 6-20. Port C Data Register (PTCD)
PTCDD5
MC9S08AC16 Series Data Sheet, Rev. 0
PTCD5
0
0
5
5
PRELIMINARY
PTCDD4
PTCD4
0
0
4
4
Description
Description
PTCDD3
PTCD3
3
0
3
0
PTCDD2
PTCD2
1
0
0
2
2
1
Chapter 6 Parallel Input/Output
PTCDD1
PTCD1
0
0
1
1
PTCDD0
PTCD0
0
0
0
0
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