M68SDIL datasheet(85/432 Pages) MOTOROLA

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Operating Modes and Resource Mapping

Internal Resource Mapping

68HC(9)12D60 — Rev 4.0

Advance Information

MOTOROLA

Operating Modes and Resource Mapping

RFSTR1, RFSTR0 — Register Following Stretch

This two bit field determines the amount of clock stretch on accesses

to the 512 byte Register Following Map. It is valid regardless of the

state of the NDRF bit. In Single Chip and Peripheral Modes this bit

has no meaning or effect.

EXSTR1, EXSTR0 — External Access Stretch

This two bit field determines the amount of clock stretch on accesses

to the External Address Space. In Single Chip and Peripheral Modes

this bit has no meaning or effect.

ROMON28, ROMON32 — Enable bits for ROM

These bits are used to enable the Flash EEPROM arrays FEE28 and

FEE32 (68HC912D60) or ROM arrays ROM28 and ROM32

(68HC12D60) respectively.

0 = Corresponding Flash EEPROM/ROM array disabled from the

memory map.

1 = Corresponding Flash EEPROM/ROM array enabled in the

memory map.

Table 5-3. RFSTR Stretch Bit Definition

RFSTR1

RFSTR0

Number of E Clocks

Stretched

Table 5-4. EXSTR Stretch Bit Definition

EXSTR1

EXSTR0

Number of E Clocks

Stretched

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

M68SDIL Datasheet(PDF) 85 Page - Motorola, Inc