MC68HC11G5 Datasheet, PDF (34/195 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller

Freescale Semiconductor, Inc.
Note:
3.5.2
There are unused register locations in the 128 byte control and status register block.
Reads of these unused registers return data from the undriven internal data bus, not from
another source that happens to be located at the same address.
Configuration Control Register (CONFIG)
The CONFIG control register is used for system configuration control functions including removal
of ROM from the memory map, and enabling of the COP watch-dog system.
7
6
5
4
3
2
1
0
$103F
NOCOP ROMON
CONFIG
RESET: See text
NOCOP — COP System Disable
READ: Any time
WRITE: If SMOD = 0, may be written once only, and only during the first 64 cycles: after
this time the bit becomes read-only. If SMOD = 1 (test or bootstrap mode),
writes are always permitted.
RESET: 0 (COP on) for SMOD = 0; 1 (COP off) for SMOD = 1
0 – COP system enabled (forces reset on timeout)
1 – COP system does not force reset on timeout
ROMON — ROM Enable
READ: Any time
WRITE: May not be written if SMOD = 0. If SMOD = 1, bit is writable at any time.
RESET: 1 (ROM on) for single chip, bootstrap and test modes; 0 (ROM off) for normal
expanded mode
1 – ROM is present in the memory map (at $C000 – $FFFF)
0 – ROM is disabled from the memory map
3.6 CONTROL/STATUS REGISTERS
The control and status registers used to control the operation of the MCU are contained in a 128 byte
block which can be relocated to any 4 kilobyte boundary in memory. Throughout this document,
control and status register addresses are displayed with the high order digit shown as a bold “1” to
indicate that the register block may be relocated to some 4 kilobyte memory page other than its
default position of $1000. Figure 3-2 is provides a complete list of the control and status registers
and reserved locations in this block of memory.
MEMORY AND CONTROL/STATUS REGISTERS
3-6
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