SPMCK16Z4MPV20 datasheet(384/500 Pages) FREESCALE

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M68HC16 Z SERIES

D-10

USER’S MANUAL

NOTE

When changing a port E pin from an output to an input, the pin will

drive high for approximately four milliseconds. This ensures that the

shared bus control signal will be in a negated state before the pin be-

comes an input.

D.2.8 Port E Pin Assignment Register

This register determines the function of port E pins. Setting a bit assigns the corre-

sponding pin to a bus control signal; clearing a bit assigns the pin to I/O port E. PE3 is

not connected to a pin. PEPA3 can be read and written, but has no function. Bits [15:8]

are unimplemented and will always read zero.

Table D-4 displays port E pin assignments.

D.2.9 Port F Data Register

This register can be accessed in two locations and can be read or written at any time.

A write to this register is stored in an internal data latch, and if any pin in the corre-

PEPAR — Port E Pin Assignment

$YFFA16

NOT USED

PEPA7

PEPA6

PEPA5

PEPA4

PEPA3

PEPA2

PEPA1

PEPA0

RESET:

DATA8

Table D-4 Port E Pin Assignments

PEPAR Bit

Port E Signal

Bus Control Signal

PEPA7

PE7

SIZ1

PEPA6

PE6

SIZ0

PEPA5

PE5

PEPA4

PE4

PEPA3

PE3

—1

NOTES:

1. The CPU16 does not support the RMC function for this pin. This bit is not

connected to a pin for I/O usage.

PEPA2

PE2

AVEC

PEPA1

PE1

DSACK1

PEPA0

PE0

DSACK0

PORTF0 — Port F Data Register 0

$YFFA18

PORTF1 — Port F Data Register 1

$YFFA1A

NOT USED

PF7

PF6

PF5

PF4

PF3

PF2

PF1

PF0

RESET:

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