MC68HC908LJ24 Datasheet, PDF (80/464 Pages) Motorola, Inc – Microcontrollers

Configuration Registers (CONFIG)
Addr.
Register Name
Bit 7
Read:
$001D
Configuration Register 2
(CONFIG2)^†
Write:
PEE
Reset: 0
$001F
Read:
Configuration Register 1
(CONFIG1)^†
Write:
Reset:
COPRS
0
† One-time writable register after each reset.
†† Reset by POR only.
6
5
4
STOP_
IRCDIS
STOP_
XCLKEN
DIV2CLK
0
0
0
LVISTOP LVIRSTD LVIPWRD
0
0
0^††
= Unimplemented
3
PCEH
0
0
0
2
1
Bit 0
PCEL LVISEL1 LVISEL0
0
0^††
1^††
SSREC STOP COPD
0
0
0
Figure 5-1. CONFIG Registers Summary
5.3 Functional Description
The configuration registers are used in the initialization of various
options. Since the various options affect the operation of the MCU, it is
recommended that these registers be written immediately after reset.
The configuration registers are located at $001D and $001F. The
configuration registers may be read at anytime.
NOTE:
The CONFIG registers are one-time writable by the user after each
reset. These 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 Figure 5-2 and Figure 5-3.
Although the LVISEL[1:0] bits default to predetermined setting of
LVISEL[1:0] = 0:1 by a POR only, these bits can still be written once after
each reset other than POR.
Data Sheet
80
MC68HC908LJ24/LK24 — Rev. 2.1
Configuration Registers (CONFIG)
Freescale Semiconductor