MC68HC711E9CFN3 Freescale Semiconductor, MC68HC711E9CFN3 Datasheet - Page 42

• Manufacturer Part Number: MC68HC711E9CFN3
• Description: IC MCU 3MHZ 12K OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E9CFN3

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 3MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: OTP
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Pin Descriptions
2.13.3 Port C
Technical Data
42
While in single-chip operating modes, all port C pins are
general-purpose I/O pins. Port C inputs can be latched into an alternate
PORTCL register by providing an input transition to the STRA signal.
Port C can also be used in full handshake modes of parallel I/O where
the STRA input and STRB output act as handshake control lines.
When in expanded multiplexed modes, all port C pins are configured as
multiplexed address/data signals. During the address portion of each
MCU cycle, bits 7–0 of the address are output on the PC7–PC0 pins.
During the data portion of each MCU cycle (E high), PC7–PC0 are
bidirectional data signals, DATA7–DATA0. The direction of data at the
port C pins is indicated by the R/W signal.
The CWOM control bit in the PIOC register disables the port C P-channel
output driver. CWOM simultaneously affects all eight bits of port C.
Because the N-channel driver is not affected by CWOM, setting CWOM
causes port C to become an open-drain type output port suitable for
wired-OR operation.
It is customary to have an external pullup resistor on lines that are driven
by open-drain devices. Port C can only be configured for wired-OR
operation when the MCU is in single-chip mode. Refer to
Parallel Input/Output (I/O) Ports
functions.
In wired-OR mode:
•
•
When a port C bit is at logic level 0, it is driven low by the
N-channel driver.
When a port C bit is at logic level 1, the associated pin has
high-impedance, as neither the N-channel nor the P-channel
devices are active.
Pin Descriptions
for additional information about port C
M68HC11E Family — Rev. 3.2
Section 6.
MOTOROLA