MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 68

• 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
4.3.4 Bootstrap Mode
Technical Data
68
When the MCU is reset in special bootstrap mode, a small on-chip
read-only memory (ROM) is enabled at address $BF00–$BFFF. The
ROM contains a bootloader program and a special set of interrupt and
reset vectors. The MCU fetches the reset vector, then executes the
bootloader.
Bootstrap mode is a special variation of the single-chip mode. Bootstrap
mode allows special-purpose programs to be entered into internal
random-access memory (RAM). When bootstrap mode is selected at
reset, a small bootstrap ROM becomes present in the memory map.
Reset and interrupt vectors are located in this ROM at $BFC0–$BFFF.
The bootstrap ROM contains a small program which initializes the serial
communications interface (SCI) and allows the user to download a
program into on-chip RAM. The size of the downloaded program can be
as large as the size of the on-chip RAM. After a 4-character delay, or
after receiving the character for the highest address in RAM, control
Operating Modes and On-Chip Memory
MCU
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
R/W
AS
Figure 4-1. Address/Data Demultiplexing
E
D1
D2
D3
D4
D5
D6
D7
D8
LE
HC373
M68HC11E Family — Rev. 3.2
OE
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
ADDR15
ADDR14
ADDR13
ADDR12
ADDR11
ADDR10
ADDR9
ADDR8
ADDR7
ADDR6
ADDR5
ADDR4
ADDR3
ADDR2
ADDR1
ADDR0
WE
OE
DATA7
DATA6
DATA5
DATA4
DATA3
DATA2
DATA1
DATA0
MOTOROLA