Mcu I/O Port Connector (P1) Pin Assignments - Motorola M68HC11EVB User Manual

SUPPORT INFORMATION
Table 6-1. MCU I/O Port Connector (P1) Pin Assignments
Pin Number Mnemonic
1
2
3
4
5
6
7
8
9-16 PC0-PC7
17
18
6-2
Signal
GND Ground
MODB MODE B - An input control line used for MCU mode selection.
A high level enables the expanded multiplexed mode, and a
low level enables the special test mode of the EVB MCU.
MODA MODE A - An input control line used for MCU mode selection
during reset. An open-drain output line used for LIR* status
indication.
STRA STROBE A - An input control line used for parallel port I/O
operations.
E ENABLE CLOCK - An output control line used for timing
reference. E clock frequency is one fourth the frequency of
the XTAL and EXTAL pins.
STRB STROBE B - An output control line used for parallel port I/O
operations.
EXTAL EXTAL - External MCU clock input line.
XTAL XTAL - Internal MCU clock line used to control the EVB clock
generator circuitry.
PORT C (bits 0-7) - General purpose I/O lines.
RESET* RESET - An active low bi-directional control line used to
initialize the MCU.
XIRQ* X INTERRUPT REQUEST - An active low input line used to
request asynchronous non-maskable interrupts to the MCU.
Signal Name and Description
M68HC11EVB/D