XC68HC12A0CPV8 Freescale Semiconductor, XC68HC12A0CPV8 Datasheet - Page 81

• Manufacturer Part Number: XC68HC12A0CPV8
• Description: IC, 16BIT MCU, 68HC12, 8MHZ, TQFP-112
• Manufacturer: Freescale Semiconductor

Specifications of XC68HC12A0CPV8

• Controller Family/series: 68HC12
• No. Of I/o's: 68
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Core Size: 16 Bit
• Program Memory Size: 60KB
• Peripherals: ADC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.5.4 Miscellaneous System Control Register
MISC — Miscellaneous Mapping Control Register
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
RESET:
RESET:
MAPROM
Bit 7
0
0
NDRF
6
0
0
Additional mapping and external resource controls are available. To use
external resources the part must be operated in one of the expanded
modes.
MAPROM — Map Location of ROM
NDRF — Narrow Data Bus for Register-Following Map Space
Normal modes: write once; Special modes: write anytime. Read
anytime.
This bit is used to swap the location of the on-chip Flash EEPROM.
0 = 28K byte array is mapped from $1000 to $7FFF, 32K byte array
is mapped from $8000 to $FFFF.
1 = 28K byte is mapped from $9000 to $FFFF, 32K byte array is
mapped from $0000 to $7FFF.
This bit enables a narrow bus feature for the 512 byte Register-
Following Map. This is useful for accessing 8-bit peripherals and
allows 8-bit and 16-bit external memory devices to be mixed in a
system. In Expanded Narrow (eight bit) modes, Single Chip Modes,
and Peripheral mode, this bit has no effect.
0 = Makes Register-Following MAP space act as a full 16 bit data bus.
1 = Makes the Register-Following MAP space act the same as an 8
bit only external data bus (data only goes through port A externally).
The Register-Following space is mapped from $0200 to $03FF after
reset, which is next to the register map. If the registers are moved this
space follows.
RFSTR1
Operating Modes and Resource Mapping
5
0
0
RFSTR0
4
0
0
EXSTR1
3
1
1
EXSTR0 ROMON28 ROMON32
2
1
1
Operating Modes and Resource Mapping
1
0
1
Internal Resource Mapping
Bit 0
0
1
Technical Data
Exp Modes
SC Modes
$0013
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