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General Description
General Release Specification
MC68HC(7)05H12
—
Rev. 1.0
22
General Description
MOTOROLA
contains an internal Schmitt trigger as part of its input to improve noise
immunity. See
Section 4 Interrupts
for more details on the interrupts.
IRQ/VPP is also the EPROM programming power pin.
1.6.6 PA0–PA7/Keyboard Interrupt
These eight I/O lines comprise port A. The state of any pin is software
programmable and all port A lines are configured as inputs during
power-on or reset. The eight I/O lines are shared with the keyboard
interrupt function. See
Section 7 Input/Output Ports
for more details
on the I/O ports.
1.6.7 PB0–PB7/ECLK, MISO, MOSI, SCK
These eight I/O lines comprise port B. The state of any pin is software
programmable and all port B lines are configured as inputs during
power-on or reset. See
Section 7 Input/Output Ports
for more details
on the I/O ports. The port pins PB5–PB7 are shared with the SPI system
(MISO, MOSI, SCK). See
Section 10 Serial Peripheral Interface
(SPI)
for more details on the operation of the SPI. Pin PB2 is shared with
the internal system clock ECLK. See
Section 2.3.1 System Control
Register
.
1.6.8 PC0–PC7/TCAP0–3, TCMP0–1, RDI, TDO
These eight I/O lines comprise port C. The state of any pin is software
programmable and all port C lines are configured as inputs during
power-on or reset. See
Section 7 Input/Output Ports
for more details
on the I/O ports. The port pins PC0–PC5 are shared with the 16-bit timer
(TCAP0–3, TCMP0–1). See
Section 9 16-Bit Timers
for more details
on the operation of the 16-bit timers. The port pins PC6 and PC7 are
shared with the SCI system (RDI and TDO). Refer to
Section 11 Serial
Communications Interface (SCI)
.