Datasheet

Operating Modes
Operating Modes
MC9S12DP256 — Revision 1.1
Operating Modes
IVIS — Internal Visibility (for both read and write accesses)
This bit determines whether internal accesses generate a bus cycle
that is visible on the external bus.
Normal: write once
Emulation: write never
Special: write anytime
1 = Internal bus operations are visible on external bus.
0 = No visibility of internal bus operations on external bus.
EMK — Emulate Port K
Normal and Emulation: write never
Special: write anytime
1 = If in any expanded mode or special peripheral mode, PORTK
and DDRK are removed from the memory map.
0 = PORTK and DDRK are in the memory map so Port K can be
used for general purpose I/O.
Table 14 MODC, MODB, MODA Write Capability
MODC MODB MODA Mode MODx Write Capability
0 0 0 Special Single Chip
MODC, B, A write anytime but not to 110
(1)
0 0 1 Emulation Exp Narrow no write
0 1 0 Special Test
MODC, B, A write anytime but not to 110
1
0 1 1 Emulation Exp Wide no write
1 0 0 Normal Single Chip
MODC write never, MODB, A write once but
not to 110
1 0 1 Normal Expanded Narrow no write
1 1 0 Special Peripheral no write
1 1 1 Normal Expanded Wide no write
1. If you are in a special single chip or special test mode and you write to this register, changing to normal single chip
mode, then one allowed write to this register remains even if you write to a special mode. If you write to normal
expanded or emulation mode, then no writes remain.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc...