mc68hc11c0 Freescale Semiconductor, Inc, mc68hc11c0 Datasheet - Page 16

• Manufacturer Part Number: mc68hc11c0
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

3.2 RAM
INIT2 — RAM Mapping
RAM[15:10] — Internal RAM Map Position
CONFIG — System Configuration Register
16
$007A
$007B
$007C
$007D
$007E
$0072
$0073
$0074
$0075
$0076
$0077
$0078
$0079
$007F
MOTOROLA
RESET:
RESET:
In expanded mode, RAM is disabled after reset. In single-chip, bootstrap, and special test modes RAM
is enabled and present at locations $0400–$04FF. The RAM can be mapped to any 1-Kbyte boundary
by writing an appropriate value to the INIT2 register. The INIT2 register must be written during the first
64 cycles after reset in expanded and single-chip modes. If RAM and the register block are placed at
the same 1-Kbyte boundary, the first 128 bytes of RAM are inaccessible. This is due to an on-chip hard-
ware priority scheme which eliminates conflicts which could arise from multiple resources sharing ad-
dress locations. Refer to the memory map diagram.
Can be written anytime in first 64 cycles in expanded or single-chip modes or at any time in other
modes.
These bits determine the upper six bits of the RAM address. At reset RAM is mapped to $0400–$04FF.
Refer to the memory map diagram.
In single-chip and expanded modes (SMOD = 0), CONFIG can only be written once. In special test and
bootstrap modes (SMOD = 1), CONFIG can be written any time. Changes do not take effect until the
first cycle of the instruction following the write to CONFIG.
The register block begins at $0000 out of reset and can be remapped to any 1K boundary.
DDG7
RAM15
Bit 7
PG7
Bit 7
Bit 7
0
0
0
—
0
0
Table 2 MC68HC11C0 Register and Control Bit Assignments (Continued)
RAM14
DDG6
PG6
—
6
0
6
0
6
0
0
0
Freescale Semiconductor, Inc.
RAM13
RWMC
For More Information On This Product,
DOD5
DDG5
PG5
5
0
5
0
5
0
0
Go to: www.freescale.com
RAM12
—
4
0
4
0
DOD4
DDG3
PG4
4
0
0
RAM11
—
3
0
3
0
DOD3
DDG3
PG3
3
0
0
NOCOP RAMON
RAM10
2
1
2
1
DOD2
DDG2
PG2
2
0
0
—
1
0
1
0
DOD1
DDH1
DDG1
PG1
PH1
1
$003F
$0037
Bit 0
Bit 0
—
—
0
0
DOD0
DDG0
DDH0
Bit 0
PH0
PG0
MC68HC11C0TS/D
MC68HC11C0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
PORTH
PORTG
DODM
DDRG
DDRH