MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 71

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Configuration Registers (CONFIG)
5.3 Functional Description
Technical Data
72
† One-time writable register after each reset.
†† Reset by POR only.
$001D
Addr.
$001F
Configuration Register 2
Configuration Register 1
Register Name
NOTE:
(CONFIG2)
(CONFIG1)
†
†
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 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.
The options except LVISEL[1:0] are one-time writable by the user after
each reset. The LVISEL[1:0] bits are 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
Reset:
Reset:
Read:
Read:
Write:
Write:
Figure 5-1. CONFIG Registers Summary
COPRS
Bit 7
Configuration Registers (CONFIG)
0
0
0
LVISTOP LVIRSTD LVIPWRD
= Unimplemented
IRCDIS
STOP_
6
0
0
XCLKEN
STOP_
5
0
0
DIV2CLK
4
0
1
Figure 5-2
PCEH
3
0
0
0
MC68HC908LJ12
and
SSREC
PCEL
Freescale Semiconductor
0
0
2
Figure
LVISEL1
STOP
0
1
0
††
5-3.
—
LVISEL0
Rev. 2.1
COPD
Bit 0
0
0
††