mc68hc11k4 Freescale Semiconductor, Inc, mc68hc11k4 Datasheet - Page 140
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mc68hc11k4
Manufacturer Part Number
mc68hc11k4
Description
Mc68hc11k1 Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC11K4.pdf
(290 pages)
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Parallel Input/Output
6.5 Port C
Technical Data
140
Single-Chip/Boot:
Expanded/Test:
Address: $0006
The state of port C at reset is mode dependent. In single-chip or
bootstrap modes, port C pins (PC[7:0]) are high-impedance inputs.
Writes to DDRC can change any of the bits to outputs. In expanded or
test modes, port C pins provide the data lines (DATA[7:0]) for external
memory devices. The MCU’s internal data bus can also be driven on port
C by setting the IRVNE bit in the system configuration options register
(OPT2). See
When port C functions as GPIO (single-chip mode), it can be configured
for wired-OR operation by setting the CWOM bit in the OPT2 register.
This disables port C’s P-channel drivers, effectively generating
open-drain-type outputs. To output a logic 0 on a wired-OR pin, the MCU
turns on its N-channel driver. To generate a logic 1, both P- and
N-channel drivers are turned off, presenting a high-impedance state
which requires an external pullup resistor to apply the appropriate
voltage level.
Reset:
Read:
Write:
Freescale Semiconductor, Inc.
For More Information On This Product,
DATA7
Figure 6-5. Port C Data Register (PORTC)
PC7I
Bit 7
PC7
Go to: www.freescale.com
Figure
Parallel Input/Output
DATA6
PC6
PC6
6
6-7.
DATA5
PC5
PC5
5
Undefined after reset
DATA4
PC4
PC4
4
DATA3
PC3
PC3
3
DATA2
PC2
PC2
2
M68HC11K Family
DATA1
PC1
PC1
1
MOTOROLA
DATA0
Bit 0
PC0
PC0
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