M68SDIL datasheet(94/432 Pages) MOTOROLA

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Bus Control and Input/Output

Advance Information

68HC(9)12D60 — Rev 4.0

Bus Control and Input/Output

MOTOROLA

PIPOE — Pipe Status Signal Output Enable

Normal: write once; Special: write anytime EXCEPT the first time.

Read anytime.

0 = PE[6:5] are general-purpose I/O (if CGMTE = 1, PE6 is a test

output signal from the CGM module).

1 = PE[6:5] are outputs and indicate the state of the instruction

queue (only effective in expanded modes).

NECLK — No External E Clock

Normal single chip: write once; special single chip: write anytime; all

other modes: write never. Read anytime. In peripheral mode, E is an

input and in all other modes, E is an output.

0 = PE4 is the external E-clock pin subject to the following

limitation: In single-chip modes, to get an E clock output signal,

it is necessary to have ESTR = 0 in addition to NECLK = 0.

1 = PE4 is a general-purpose I/O pin.

LSTRE — Low Strobe (LSTRB) Enable

Normal: write once; Special: write anytime EXCEPT the first time.

Read anytime. This bit has no effect in single-chip modes or normal

expanded narrow mode.

0 = PE3 is a general-purpose I/O pin.

1 = PE3 is configured as the LSTRB bus-control output, provided

the MCU is not in single chip or normal expanded narrow

modes.

LSTRB is used during external writes. After reset in normal expanded

mode, LSTRB is disabled. If needed, it should be enabled before

external writes. External reads do not normally need LSTRB because

all 16 data bits can be driven even if the MCU only needs 8 bits of

data.

In normal expanded narrow mode this pin is reset to an output driving

high allowing the pin to be an output while in and immediately after

reset.

TAGLO is a shared function of the PE3/LSTRB pin. In special

expanded modes with LSTRE set and the BDM tagging on, a zero at

the falling edge of E tags the instruction word low byte being read into

the instruction queue.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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