MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 96

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

MISC — Miscellaneous Mapping Control Register
PPAGE — (Program) Page Index Register
Resource Mapping
6.5 Miscellaneous System Control Register
Technical Data
96
RESET:
RESET:
RESET:
ROMTST
Bit 7
Bit 7
0
0
0
0
NDRF
6
0
0
6
0
0
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.
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.
RFSTR1
0 = 16K window for Flash memory is located from $8000-$BFFF
1 = 32K window for Flash memory is located from $8000-$FFFF
5
0
0
5
0
0
RFSTR0
Resource Mapping
4
0
0
4
0
0
EXSTR1
3
1
1
3
0
0
EXSTR0
PIX2
2
1
1
2
0
ROMHM
MC68HC912DT128A — Rev 4.0
PIX1
1
0
0
1
0
ROMON
Bit 0
PIX0
Bit 0
0
1
0
MOTOROLA
peripheral or
Exp mode
SC mode
Mode
$00FF
$0013