MC68HC08AZ32A Datasheet, PDF (109/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Chapter 10
Mask Options
10.1 Introduction
This section describes the mask options and the mask option registers. The mask options are hardwired
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 of the following functions:
• Resets caused by the LVI module
• Power to the LVI module
• Stop mode recovery time (32 CGMXCLK cycles or 4096 CGMXCLK cycles)
• ROM security⁽¹⁾
• STOP instruction
• Computer operating properly (COP) module enable
• EEPROM read protection⁽¹⁾
• COP time-out period
• EEPROM reference clock source
10.2 Functional Description
Address: $001F
Bit 7
6
5
Read: LVISTOP ROMSEC LVIRST
Write:
Reset:
= Unimplemented
4
LVIPWR
3
SSREC
Unaffected by reset
2
COPRS
1
STOP
Bit 0
COPD
Figure 10-1. Mask Option Register A (MORA)
LVISTOP — LVI Stop Mode Enable Bit
LVISTOP enables the LVI module in stop mode. See Chapter 9 Low-Voltage Inhibit (LVI) Module).
1 = LVI enabled during stop mode
0 = LVI disabled during stop mode
ROMSEC — ROM Security Bit
ROMSEC enables the ROM security feature. Setting the ROMSEC bit prevents access to the ROM
contents.
1 = ROM security enabled
0 = ROM security disabled
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the ROM/EEPROM data
difficult for unauthorized users.
MC68HC08AZ32A Data Sheet, Rev. 2
Freescale Semiconductor
109