MC68HC05X4 Datasheet, PDF (12/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Introduction
Freescale Semiconductor, Inc.
Mask options on the MC68HC705X4
The same options as for the MC68HC05X4 are available on the
MC68HC705X4 device. These options must be programmed into the
mask option register (MOR), at EPROM address $1F00, via the
bootloader mode prior to operating the device in single chip mode. The
MOR is latched in at reset in single chip mode to allow emulation of the
masked ROM part. It is recommended that all unused bits in this register
are written as ‘0’.
Mask option
register (MOR)
This register may be written to only in bootloader mode.
Address: $1F00
Bit 7
6
5
4
3
2
1
Bit 0
DIV2
0
0
COP
Reset: –
–
–
–
0
0
0
0
Figure 2. Mask Option Register (MOR)
DIV2 — Oscillator
division ratio
1 = Selects divide-by-2 option.
0 = Selects divide-by-10 option.
NOTE: The divide-by-10 option is forced during t_PORL (applies only to the
MC68HC705X4).
COP — Computer
operating
properly
enable/disable
1 = Disables COP.
0 = Enables COP.
MC68HC05X4 Rev 1.0
12
Introduction
For More Information On This Product,
Go to: www.freescale.com
4-intro
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