Configuring a 68HC11F1

meterman1980 — Tue, 26 Jul 2022 16:03:04 GMT

So I have a project that uses a 68HC11F1, and I am not sure I have it set up correctly.

Memory map (addresses not listed are not used):

0x0080-0x01FF Internal RAM (allocated for firmware use)

0x03D0-0x03FF Internal RAM (processor stack)

0x1000-0x105F HC11 register space (to be configured)

0x2000-0x200F I/O space 1

0x4000-0x400F I/O space 2

0xE000-0xFFBF Firmware ROM (external, 2764)

0xFFC0-0xFFFF Vectors (only XIRQ and Reset are required)

Hardware configuration: Expanded mode (MODA, MODB pulled to +5V)

Port A, Port D, Port E, Port G: Not used

Port B: Address A8-A15

Port C: Data D0-D7

Port F: Address A0-A7

XTAL driven by external 1MHz

EXTAL pulled down w/ 10K resistor

E not connected

4XOUT: Not connected

IRQ: Pulled high

XIRQ: Driven by external signal

Vrh, Vrl: Pulled down w/ 10K resistor

R/W: Connected to other ICs as expected

Reset: Connected to other ICs as expected

So, my question: Which registers in the group 0x1000-0x105F do I need to pay attention to?

topic Configuring a 68HC11F1 in 8-bit Microcontrollers