Datasheet

Resource Mapping
Technical Data MC68HC912DT128A — Rev 4.0
96 Resource Mapping MOTOROLA
Read and write: anytime.
This register determines the active page viewed through
MC68HC912DT128A windows.
CALL and RTC instructions have a special single wire mechanism to
read and write this register without using an address bus.
6.5 Miscellaneous System Control Register
Additional mapping and external resource controls are available. To use
external resources the part must be operated in one of the expanded
modes.
Normal modes: write once; Special modes: write anytime. Read
anytime.
ROMTST — FLASH EEPROM Test mode
In normal modes, this bit is forced to zero.
0 = 16K window for Flash memory is located from $8000-$BFFF
1 = 32K window for Flash memory is located from $8000-$FFFF
PPAGE — (Program) Page Index Register $00FF
Bit 7 6 5 4 3 2 1 Bit 0
0 0 0 0 0 PIX2 PIX1 PIX0
RESET: 0 0 0 0 0 0 0 0
MISC — Miscellaneous Mapping Control Register $0013
Bit 7654321Bit 0Mode
ROMTST NDRF RFSTR1 RFSTR0 EXSTR1 EXSTR0 ROMHM ROMON
RESET: 0 0 0 0 1 1 0 0 Exp mode
RESET: 0 0 0 0 1 1 0 1
peripheral or
SC mode
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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