MC68HC08AS32 Datasheet, PDF (59/394 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Advance Information — MC68HC08AS32
Section 5. Mask Options
5.1 Contents
5.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
5.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
5.4 Mask Option Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
5.2 Introduction
This section describes use of mask options by custom-masked ROMs
and the mask option register in the MC68HC08AS32.
5.3 Functional Description
The mask options are hard-wired connections, specified at the same
time as the ROM code, which allow the user to customize the MCU. The
options control the enable or disable ability of the following functions:
• ROM security¹
• Resets caused by the LVI module
• Power to the LVI module
• Stop mode recovery time (32 CGMXCLK cycles or 4096
CGMXCLK cycles)
• COP timeout period (2¹⁸–2⁴ CGMXCLK cycles or 2¹³â€“2⁴
CGMXCLK cycles)
• STOP instruction
• Computer operating properly module (COP)
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the ROM data difficult for unauthorized users.
MC68HC08AS32 — Rev. 3.0
MOTOROLA
Mask Options
Advance Information
59