MC9S12T64 Datasheet, PDF (128/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Module Mapping Control (MMC)
Miscellaneous
System Control
Register (MISC)
Additional mapping and external resource controls are available. To use
external resources the part must be operated in one of the expanded
modes.
Read: Anytime
Write: Refer to each bit for individual write conditions.
NOTE: Writes to this register take one cycle to go into effect.
Address Offset: $0013
Bit 7
6
5
4
3
Read: 0
0
0
0
EXSTR1
Write:
Reset: 0
0
0
0
1
Reset: 0
0
0
0
1
Reset: 0
0
0
0
1
= Unimplemented
1. Determined by state of PK7 pin during reset. See Table 24.
2
EXSTR0
1
1
1
1
ROMHM
0
0
0
Bit 0
Mode
ROMON
(1)
Normal Expanded
or Emulation Mode
1
Peripheral or
Single Chip Mode
0 Special Test Mode
EXSTR1, EXSTR0 — External Access Stretch
Write: Once in Normal and Emulation modes and anytime in Special
modes
This two bit field determines the amount of clock stretch on accesses
to the external address space as shown in Table 23 below. In single
chip and peripheral modes these bits have no meaning or effect.
Table 23 EXSTR Stretch Bit Definition
Stretch bit
EXSTR1
0
0
1
1
Stretch bit
EXSTR0
0
1
0
1
Number of E Clocks
Stretched
0
1
2
3
MC9S12T64Revision 1.1.1
128
Module Mapping Control (MMC)
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