MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 89

• Manufacturer Part Number: MC68HC711E20CFN2
• Description: IC MCU 20K 2MHZ OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E20CFN2

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 2MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: OTP
• Eeprom Size: 512 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.4.3.2 RAM and I/O Mapping Register
M68HC11E Family — Rev. 3.2
MOTOROLA
ROMON — ROM/EPROM/OTPROM Enable Bit
EEON — EEPROM Enable Bit
The internal registers used to control the operation of the MCU can be
relocated on 4-Kbyte boundaries within the memory space with the use
of the RAM and I/O mapping register (INIT). This 8-bit special-purpose
register can change the default locations of the RAM and control
registers within the MCU memory map. It can be written only once within
the first 64 E-clock cycles after a reset in normal modes, and then it
becomes a read-only register.
RAM[3:0] — RAM Map Position Bits
Address:
Reset:
Read:
Write:
When this bit is 0, the ROM or EPROM is disabled and that memory
space becomes externally addressed. In single-chip mode, ROMON
is forced to 1 to enable ROM/EPROM regardless of the state of the
ROMON bit.
When this bit is 0, the EEPROM is disabled and that memory space
becomes externally addressed.
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.
It is initialized to address $0000 out of reset. Refer to
0 = ROM disabled from the memory map
1 = ROM present in the memory map
0 = EEPROM removed from the memory map
1 = EEPROM present in the memory map
Operating Modes and On-Chip Memory
Figure 4-12. RAM and I/O Mapping Register (INIT)
$103D
RAM3
Bit 7
0
RAM2
6
0
RAM1
5
0
RAM0
4
0
Operating Modes and On-Chip Memory
REG3
3
0
REG2
2
0
Table
REG1
Technical Data
1
0
Memory Map
4-4.
REG0
Bit 0
1
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