MC68HC711G5 MOTOROLA [Motorola, Inc], MC68HC711G5 Datasheet - Page 45

• Manufacturer Part Number: MC68HC711G5
• Description: High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC11G5
RESET:
Bit 5 of Port D is dedicated as the active low slave select (SS) input, when the SPI system is enabled.
In SPI slave mode, DDRD bit 5 has no meaning or effect. In SPI master mode, DDRD bit 5
determines whether Port D bit 5 is an error detect input to the SPI (DDRD bit clear) or a general
purpose output line (DDRD bit set).
For bits 2, 3, & 4 (MISO, MOSI, & SCK): if the SPI is enabled and expects the bit to be an input, it
will be an input regardless of the state of the DDRD bit; if the SPI is enabled and expects the bit to
be an output, it will be an output only if the DDRD bit is set.
Port E is an 8-bit port which supports the 8-channel A/D converter. Any channels not used
for A/D may be used as general purpose inputs.
Since there is no output drive logic associated with Port E there is no DDRE register. Port E pins
are capable of withstanding negative 1 volt transients (current limited by an external 10 k or greater
resistor) without affecting MCU operation, other than possible loss of the A/D input sample for a
conversion being performed at the time of the transient. Using Port E pins as A/D inputs does not
affect the ability to read these pins as static inputs. However, reading Port E during an A/D
conversion sequence may inject noise into the analog input signals and may result in reduced
accuracy of the A/D result. Note that performing a digital read of Port E, with levels other than V
or V
4.8.1
READ:
WRITE:
RESET:
4.8
SS
Alternate Pin Function:
on the Port E pins, will result in greater power dissipation during the read cycle.
PORT E
Data Register (PORTE)
$00 (all general purpose I/O configured for input only).
0 – Bits set to zero configure the corresponding I/O pins as inputs.
1 – Bits set to one configure the corresponding I/O pins as outputs.
Any time (returns sensed levels at Port E pins).
Has no meaning or effect.
Does not affect this address.
RESET:
$100A
PE7
AN7
U
7
PE6
AN6
U
6
INPUT/OUTPUT PORTS
PE5
AN5
U
5
PE4
AN4
U
4
PE3
AN3
U
3
PE2
AN2
U
2
PE1
AN1
U
1
PE0
AN0
U
0
MOTOROLA
PORTE
4-7
DD