mc9s12ne64 Freescale Semiconductor, Inc, mc9s12ne64 Datasheet - Page 413
mc9s12ne64
Manufacturer Part Number
mc9s12ne64
Description
Hcs12 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12NE64.pdf
(554 pages)
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15.3.2.12 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
RDRK
RDPE
RDPB
RDPA
ESTR
Field
Field
Peripheral
7
4
1
0
0
Reset:
W
R
Reduced Drive of Port K
0 All port K output pins have full drive enabled.
1 All port K output pins have reduced drive enabled.
Reduced Drive of Port E
0 All port E output pins have full drive enabled.
1 All port E output pins have reduced drive enabled.
Reduced Drive of Port B
0 All port B output pins have full drive enabled.
1 All port B output pins have reduced drive enabled.
Reduced Drive of Ports A
0 All port A output pins have full drive enabled.
1 All port A output pins have reduced drive enabled.
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 15-16. External Bus Interface Control Register (EBICTL)
= Unimplemented or Reserved
6
0
0
0
Table 15-11. EBICTL Field Descriptions
Table 15-10. RDRIV Field Descriptions
MC9S12NE64 Data Sheet, Rev. 1.1
5
0
0
0
Description
0
0
0
Description
4
0
0
0
3
Memory Map and Register Definition
0
0
0
2
0
0
0
1
ESTR
0
1
0
413
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