mc68hc11d0cfn2 Freescale Semiconductor, Inc, mc68hc11d0cfn2 Datasheet - Page 70

• Manufacturer Part Number: mc68hc11d0cfn2
• Description: M68hc11 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
5.4 Port C
5.4.1 Port C Control Register
5.4.2 Port C Data Register
Data Sheet
70
Port C is an 8-bit, general-purpose I/O port with a data register (PORTC) and a data
direction register (DDRC). In the single-chip mode, port C pins are general-purpose
I/O pins (PC7–PC0). In the expanded-multiplexed mode, port C pins are configured
as multiplexed address/data pins. During the address cycle, bits 7–0 of the address
are output on PC7–PC0. During the data cycle, bits 7–0 (PC7–PC0) are
bidirectional data pins controlled by the R/W signal.
CWOM — Port C Wire-OR Mode Bit
PORTC can be read at any time. Inputs return the sensed levels at the pin, while
outputs return the input level of the port C pin drivers. If PORTC is written, the data
is stored in an internal latch and can be driven only if port C is configured for
general-purpose outputs in single-chip or bootstrap mode.
Port C pins are general-purpose inputs out of reset in single-chip and bootstrap
modes. These pins are multiplexed low-order address and data bus lines out of
reset in expanded-multiplexed and test modes.
Address:
Address:
Reset:
Reset:
Read:
Write:
Read:
Write:
1 = Port C outputs are open drain (to facilitate testing)
0 = Port C operates normally
Freescale Semiconductor, Inc.
For More Information On This Product,
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Bit 7
Bit 7
PC7
0
0
0
Go to: www.freescale.com
Figure 5-4. Port C Control Register (PIOC)
Figure 5-5. Port C Data Register (PORTC)
Input/Output (I/O) Ports
PC6
6
0
0
6
0
CWOM
PC5
5
0
5
0
PC4
0
4
4
0
0
PC3
3
0
0
3
0
PC2
2
0
0
2
0
MC68HC711D3 — Rev. 2
PC1
1
0
0
1
0
MOTOROLA
Bit 0
Bit 0
PC0
0
0
0