mc68hc908rf2 Freescale Semiconductor, Inc, mc68hc908rf2 Datasheet - Page 43

• Manufacturer Part Number: mc68hc908rf2
• Description: M68hc08 Microcontrollers Microcontroller / Transmitter
• Manufacturer: Freescale Semiconductor, Inc

Data Sheet — MC68HC908RF2
3.1 Introduction
3.2 Functional Description
MC68HC908RF2 — Rev. 4.0
MOTOROLA
NOTE:
This section describes the configuration register (CONFIG). The configuration
register enables or disables these options:
The CONFIG register is used in the initialization of various options and can be
written once after each reset. The register is set to the documented value during
reset. Since the various options affect the operation of the MCU, it is recommended
that these registers be written immediately after reset. The configuration register is
located at $001F.
On a FLASH device, the options are one-time writable by the user after each reset.
The CONFIG register is not in the FLASH memory but is a special register
containing one-time writable latches after each reset. Upon a reset, the CONFIG
register defaults to predetermined settings as shown in
EXTSLOW — Slow External Crystal Enable Bit
Address: $001F
•
•
•
•
•
The EXTSLOW bit has two functions. It configures the ICG module for a fast
(1 MHz–8 MHz) or slow (30 kHz–100 kHz) speed crystal. The option also
configures the clock monitor operation in the ICG module to expect an external
Reset:
Read:
Write:
Stop mode recovery time (32 CGMXCLK cycles or 4,096 CGMXCLK cycles)
COP timeout period (2
STOP instruction
Computer operating properly module (COP)
Low-voltage inhibit (LVI) module control
Freescale Semiconductor, Inc.
For More Information On This Product,
EXTSLOW
BIt 7
0
Configuration Register (CONFIG)
Figure 3-1. Configuration Register (CONFIG)
Go to: www.freescale.com
LVISTOP
Section 3. Configuration Register (CONFIG)
6
0
18
LVIRST
5
1
– 2
4
or 2
LVIPWR
13
4
1
– 2
4
COPRS
CGMXCLK cycles)
3
0
Figure 2-1. Memory
SSREC
2
0
STOP
1
0
Data Sheet
COPD
Bit 0
0
Map.
43