s908gr32ag3vfa Freescale Semiconductor, Inc, s908gr32ag3vfa Datasheet - Page 89

• Manufacturer Part Number: s908gr32ag3vfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 5
Configuration Register (CONFIG)
5.1 Introduction
This section describes the configuration registers, CONFIG1 and CONFIG2. The configuration registers
enable or disable these options:
5.2 Functional Description
The configuration registers are used in the initialization of various options. The configuration registers can
be written once after each reset. All of the configuration register bits are cleared during reset. Since the
various options affect the operation of the microcontroller unit (MCU), it is recommended that these
registers be written immediately after reset. The configuration registers are located at $001E and $001F
and may be read at anytime.
Freescale Semiconductor
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Stop mode recovery time (32 CGMXCLK cycles or 4096 CGMXCLK cycles)
COP timeout period (262,128 or 8176 CGMXCLK cycles)
STOP instruction
Computer operating properly module (COP)
Low-voltage inhibit (LVI) module control and voltage trip point selection
Enable/disable the oscillator (OSC) during stop mode
Enable/disable an extra divide by 128 prescaler in timebase module
Selectable clockout (MCLK) feature with divide by 1, 2, and 4 of the bus or crystal frequency
Timebase clock select
On a FLASH device, the options except LVI5OR3 are one-time writable by
the user after each reset. This bit is one-time writable by the user only after
each POR (power-on reset). The CONFIG registers are not in the FLASH
memory but are special registers containing one-time writable latches after
each reset. Upon a reset, the CONFIG registers default to predetermined
settings as shown in
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
Figure 5-1
and
NOTE
Figure
5-2.
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