SPMCK16Z4MPV16 datasheet(399/500 Pages) FREESCALE

399 / 500 page

M68HC16 Z SERIES

USER’S MANUAL

D-25

D.4 Masked ROM Module

The MRM is used only in the MC68HC16Z2 and the MC68HC16Z3. Table D-21 shows

the MRM address map.

The reset states shown for the MRM registers are for the generic (blank ROM) ver-

sions of the device. Several MRM register bit fields can be user-specified on a custom

masked ROM device. Contact a Freescale sales representative for information on or-

dering a custom ROM device.

D.4.1 Masked ROM Module Configuration Register

STOP — Low-Power Stop Mode Enable

The reset state of the STOP bit is the complement of DATA14 state during reset. The

ROM array base address cannot be changed unless the STOP bit is set.

0 = ROM array operates normally.

1 = ROM array operates in low-power stop mode. The ROM array cannot be read

in this mode.

This bit may be read or written at any time.

Table D-21 MRM Address Map

Address

$YFF820

Masked ROM Module Configuration Register (MRMCR)

$YFF822

Not Used

$YFF824

ROM Array Base Address Register High (ROMBAH)

$YFF826

ROM Array Base Address Register Low (ROMBAL)

$YFF828

Signature Register High (SIGHI)

$YFF82A

Signature Register Low (SIGLO)

$YFF82C

Not Used

$YFF82E

Not Used

$YFF830

ROM Bootstrap Word 0 (ROMBS0)

$YFF832

ROM Bootstrap Word 1 (ROMBS1)

$YFF834

ROM Bootstrap Word 2 (ROMBS2)

$YFF836

ROM Bootstrap Word 3 (ROMBS3)

$YFF838

Not Used

$YFF83A

Not Used

$YFF83C

Not Used

$YFF83E

Not Used

MRMCR — Masked ROM Module Configuration Register

$YFF820

STOP

BOOT

LOCK

EMUL

ASPC[1:0]

WAIT[1:0]

NOT USED

RESET:

DATA14

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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