MC68HC705P6A Datasheet, PDF (91/130 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Advance Information — MC68HC705P6A
Section 11. Mask Option Register (MOR)
11.1 Contents
11.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
11.3 Mask Option Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
11.4 MOR Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
11.2 Introduction
The mask option register (MOR) contains two bytes of EPROM used to
enable or disable each of the features controlled by mask options on the
MC68HC05P6 (a ROM version of the MC68HC705P6A).
The seven programmable options on the MC68HC705P6A are:
1. COP watchdog timer (enable or disable)
2. IRQ triggering (edge- or edge- and level-sensitive)
3. SIOP data bit order (most significant bit or least significant bit first)
4. SIOP clock rate (OSC divided by 8, 16, 32, or 64)
5. Stop instruction mode (stop mode or halt mode)
6. Secure EPROM from external reading
7. Keyscan interrupt/pullups on PA0–PA7
11.3 Mask Option Register
Mask options are programmed into the mask option register (MOR) by
the firmware in the bootloader ROM. See Figure 11-1.
MC68HC705P6A — Rev. 2.0
MOTOROLA
Mask Option Register (MOR)
Advance Information
91