mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 529

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

18.3.2.12 External Bus Interface Control Register (EBICTL)
Read: Anytime (provided this register is in the map)
Write: Refer to individual bit descriptions below
The EBICTL register is used to control miscellaneous functions (i.e., stretching of external E clock).
This register is not in the on-chip memory map in expanded and special peripheral modes. Therefore, these
accesses will be echoed externally.
Freescale Semiconductor
All other modes
ESTR
Field
Peripheral
0
Reset:
W
R
E Clock Stretches — This control bit determines whether the E clock behaves as a simple free-running clock or
as a bus control signal that is active only for external bus cycles.
Normal and Emulation: write once
Special: write anytime
0 E never stretches (always free running).
1 E stretches high during stretched external accesses and remains low during non-visible internal accesses.
This bit has no effect in single-chip modes.
7
0
0
0
Figure 18-17. External Bus Interface Control Register (EBICTL)
= Unimplemented or Reserved
6
0
0
0
Table 18-11. EBICTL Field Descriptions
MC9S12E256 Data Sheet, Rev. 1.08
5
0
0
0
4
0
0
0
Description
Chapter 18 Multiplexed External Bus Interface (MEBIV3)
0
0
0
3
0
0
0
2
0
0
0
1
ESTR
0
1
0
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