MC68HC16Z1CAG16 Datasheet, PDF (401/500 Pages) Freescale Semiconductor, Inc – M68HC16Z Series users manual

Freescale Semiconductor, Inc.
D.4.2 ROM Array Base Address Registers
ROMBAH — ROM Array Base Address Register High
$YFF824
15
14
13
12
11
10
9
0
0
0
0
0
0
0
RESET:
8
7
6
5
4
3
2
1
0
0
ADDR ADDR ADDR ADDR ADDR ADDR ADDR ADDR
23
22
21
20
19
18
17
16
1
1
1
1
1
1
1
1
The reset value of the shaded bits is user specified, but the bits can be written after
reset to change the base address. If the values of ROMBAH bits ADDR[23:20] do not
match that of ADDR19, the CPU16 cannot access the ROM array.
ROMBAL — ROM Array Base Address Register Low
$YFF826
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ADDR ADDR
15
14
RESET:
0
0
ADDR
13
0
ADDR
12
ADDR
11
ADDR
10
ADDR
9
ADDR
8
ADDR
7
ADDR
6
ADDR
5
ADDR
4
ADDR
3
ADDR
2
ADDR
1
ADDR
0
ROMBAH and ROMBAL specify the ROM array base address. The reset state of
these registers is specified at mask time. They can only be written when STOP = 1 and
LOCK = 0. This prevents accidental remapping of the array. Because the 8-Kbyte
ROM array in the MC68HC16Z2 and the MC68HC16Z3 must be mapped to an 8-
Kbyte boundary, ROMBAL bits [12:0] always contain $0000. ROMBAH ADDR[15:8]
read zero.
D.4.3 ROM Signature Registers High
RSIGHI — ROM Signature Register High
$YFF828
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
RSP18 RSP17 RSP16
RESET:
0
0
0
RSIGLO — ROM Signature Register Low
$YFF82A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RSP15 RSP14 RSP13 RSP12 RSP11 RSP10 RSP9 RSP8 RSP7 RSP6 RSP5 RSP4 RSP3 RSP2 RSP1 RSP0
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Signature registers RSIGHI and RSIGLO contain a user-specified mask-programmed
signature pattern. A user-specified signature algorithm provides the capability to verify
ROM array contents.
M68HC16 Z SERIES
USER’S MANUAL
REGISTER SUMMARY
For More Information On This Product,
Go to: www.freescale.com
D-27