mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 407

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

D.4.2 ROM Array Base Address Registers
ROMBAH — ROM Array Base Address Register High
ROMBAL — ROM Array Base Address Register Low
D.4.3 ROM Signature Registers
RSIGHI — ROM Signature High Register
RSIGLO — ROM Signature Low Register
MC68HC16Y3/916Y3
USER’S MANUAL
RSP15
ADDR
NOTES:
15
15
15
15
15
0
0
0
0
RESET:
RESET:
RESET:
RESET:
1. Reset value of the shaded bits is user specified but the bits can be written after reset to change the base address.
ROMBAH and ROMBAL specify 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 MC68HC16Y3/916Y3 must be mapped to an 8-Kbyte boundary,
ROMBAL bits [12:0] always contain $0000. ROMBAH ADDR[15:8] read zero.
RSIGHI and RSIGLO specify a ROM signature pattern. A user-written signature iden-
tification algorithm allows identification of the ROM array content. The signature is
specified at mask time and cannot be changed.
If the values of ROMBAH bits ADDR[23:20] do not match that of ADDR19, however, the CPU16 cannot access
the ROM array.
RSP14
ADDR
14
14
14
14
14
0
0
0
0
RSP13
ADDR
13
13
13
13
13
0
0
0
0
RSP12
12
12
12
12
0
0
0
0
RSP11
Freescale Semiconductor, Inc.
11
11
11
11
0
0
0
0
For More Information On This Product,
RSP10
10
10
10
10
0
0
0
0
NOT USED
Go to: www.freescale.com
RSP9
REGISTER SUMMARY
9
0
9
0
9
0
9
0
RSP8
8
0
8
0
8
0
8
0
ADDR
RSP7
23
7
1
7
0
7
0
7
0
ADDR
RSP6
22
6
1
6
0
6
0
6
0
1
ADDR
RSP5
21
5
1
5
0
5
0
5
0
ADDR
RSP4
20
4
1
4
0
4
0
4
0
ADDR
RSP3
19
3
1
3
0
3
0
3
0
RSP18
ADDR
RSP2
18
2
1
2
0
2
0
2
0
$YFF82A
MOTOROLA
$YFF824
$YFF826
$YFF828
RSP17
ADDR
RSP1
17
1
1
1
0
1
0
1
0
RSP16
ADDR
RSP0
D-29
16
0
1
0
0
0
0
0
0