mc68hc11f1cpu3 Freescale Semiconductor, Inc, mc68hc11f1cpu3 Datasheet - Page 49

• Manufacturer Part Number: mc68hc11f1cpu3
• Description: Mc68hc11f1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

RAM[3:0] — RAM Map Position
REG[3:0] — 128-Byte Register Block Position
4.3.2.3 OPTION Register
OPTION — System Configuration Options
TECHNICAL DATA
RESET:
These four bits, which specify the upper hexadecimal digit of the RAM address, control
position of RAM in the memory map. RAM can be positioned at the beginning of any
4-Kbyte page in the memory map. Refer to Table 4-5.
These four bits specify the upper hexadecimal digit of the address for the 128-byte
block of internal registers. The register block is positioned at the beginning of any 4-
Kbyte page in the memory map. Refer to Table 4-5.
When the memory map has the 96-byte register block mapped at the same location
as RAM, the registers have priority and the lower 96 bytes of RAM are inaccessible.
No harmful conflicts occur due to a hardware resource priority scheme. On-chip reg-
isters have the highest priority of all on-chip resources, followed by on-chip RAM, boot-
strap ROM, and on-chip EEPROM.
The 8-bit special-purpose OPTION register sets internal system configuration options
during initialization. In single-chip and expanded modes (SMOD = 0), IRQE, DLY, FC-
ME, and CR[1:0] can be written only once and only in the first 64 cycles after a reset.
This minimizes the possibility of any accidental changes to the system configuration.
In special test and bootstrap modes (SMOD = 1), these bits can be written at any time.
*Can be written only once in first 64 cycles out of reset in normal modes or at any time in special modes.
RAM[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
ADPU
Bit 7
0
CSEL
$C000–$C3FF
$D000–$D3FF
$A000–$A3FF
$B000–$B3FF
$E000–$E3FF
$0000–$03FF
$1000–$13FF
$2000–$23FF
$3000–$33FF
$4000–$43FF
$5000–$53FF
$6000–$63FF
$7000–$73FF
$8000–$83FF
$9000–$93FF
$F000–$F3FF
6
0
Freescale Semiconductor, Inc.
Location
OPERATING MODES AND ON-CHIP MEMORY
Table 4-5 RAM and Register Mapping
For More Information On This Product,
IRQE*
5
0
Go to: www.freescale.com
DLY*
4
0
CME
0
3
REG[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
FCME*
2
0
CR1*
1
0
$A000–$A05F
$B000–$B05F
$C000–$C05F
$D000–$D05F
$E000–$E05F
$F000–$F05F
$0000–$005F
$1000–$105F
$2000–$205F
$3000–$305F
$4000–$405F
$5000–$505F
$6000–$605F
$7000–$705F
$8000–$805F
$9000–$905F
Location
CR0*
Bit 0
0
$1039
4-11