MC68HC16Z1 Datasheet, PDF (402/500 Pages) Freescale Semiconductor, Inc – M68HC16Z Series

Freescale Semiconductor, Inc.
D.4.4 ROM Bootstrap Words
ROMBS0 — ROM Bootstrap Word 0
$YFF830
15
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9
8
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4
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2
1
0
NOT USED
ZK[3:0]
SK[3:0]
PK[3:0]
ROMBS1 — ROM Bootstrap Word 1
$YFF832
15
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1
0
PC[15:0]
ROMBS2 — ROM Bootstrap Word 2
$YFF834
15
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2
1
0
SP[15:0]
ROMBS3 — ROM Bootstrap Word 3
$YFF836
15
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2
1
0
IZ[15:0]
Typically, CPU16 reset vectors reside in non-volatile memory and are fetched when
the CPU16 comes out of reset. These four words can be used as reset vectors with
the contents specified at mask time. The content of these words cannot be changed.
On generic (blank ROM) MC68HC16Z2 and MC68HC16Z3 devices, ROMBS[0:3] are
masked to $0000. When the ROM on the MC68HC16Z2 and MC68HC16Z3 is masked
with customer specific code, ROMBS[0:3] respond to system addresses $00000 to
$00006 during the reset vector fetch if BOOT = 0.
D-28
REGISTER SUMMARY
For More Information On This Product,
Go to: www.freescale.com
M68HC16 Z SERIES
USER’S MANUAL