MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 80

• 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

Operating Modes and On-Chip Memory
4.4.1 RAM and Input/Output Mapping
Technical Data
80
Hardware priority is built into RAM and I/O mapping. Registers have
priority over RAM and RAM has priority over ROM. When a lower priority
resource is mapped at the same location as a higher priority resource, a
read/write of a location results in a read/write of the higher priority
resource only. For example, if both the register block and the RAM are
mapped to the same location, only the register block will be accessed. If
RAM and ROM are located at the same position, RAM has priority.
The fully static RAM can be used to store instructions, variables, and
temporary data. The direct addressing mode can access RAM locations
using a 1-byte address operand, saving program memory space and
execution time, depending on the application.
RAM contents can be preserved during periods of processor inactivity by
two methods, both of which reduce power consumption. They are:
1. In the software-based stop mode, the clocks are stopped while
2. In the second method, the MODB/V
V
related to operating frequency in CMOS integrated circuits, only a
very small amount of leakage exists when the clocks are stopped.
power from a battery backup or from a second power supply.
Figure 4-8
5-volt device. Adjustments to the circuit must be made for devices
that operate at lower voltages. Using the MODB/V
require external hardware, but can be justified when a significant
amount of external circuitry is operating from V
to maintain RAM contents, reset must be held low whenever V
is below normal operating level. Refer to
Interrupts.
Operating Modes and On-Chip Memory
DD
powers the MCU. Because power supply current is directly
shows a typical standby voltage circuit for a standard
STBY
M68HC11E Family — Rev. 3.2
Section 5. Resets and
pin can supply RAM
DD
. If V
STBY
STBY
MOTOROLA
pin may
is used
DD