MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 98

• 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
4.6 EEPROM
4.6.1 EEPROM and CONFIG Programming and Erasure
Technical Data
98
PGM — EPROM Programming Voltage Enable Bit
Some E-series devices contain 512 bytes of on-chip EEPROM. The
MC68HC811E2 contains 2048 bytes of EEPROM with selectable base
address. All E-series devices contain the EEPROM-based CONFIG
register.
The erased state of an EEPROM bit is 1. During a read operation, bit
lines are precharged to 1. The floating gate devices of programmed bits
conduct and pull the bit lines to 0. Unprogrammed bits remain at the
precharged level and are read as 1s. Programming a bit to 1 causes no
change. Programming a bit to 0 changes the bit so that subsequent
reads return 0.
When appropriate bits in the BPROT register are cleared, the PPROG
register controls programming and erasing the EEPROM. The PPROG
register can be read or written at any time, but logic enforces defined
programming and erasing sequences to prevent unintentional changes
to EEPROM data. When the EELAT bit in the PPROG register is cleared,
the EEPROM can be read as if it were a ROM.
The on-chip charge pump that generates the EEPROM programming
voltage from V
value. The efficiency of this charge pump and its drive capability are
affected by the level of V
load depends on the number of bits being programmed or erased and
capacitances in the EEPROM array.
The clock source driving the charge pump is software selectable. When
the clock select (CSEL) bit in the OPTION register is 0, the E clock is
PGM can be read any time and can be written only when ELAT = 1.
0 = Programming voltage to EPROM array disconnected
1 = Programming voltage to EPROM array connected
Operating Modes and On-Chip Memory
DD
uses MOS capacitors, which are relatively small in
DD
and the frequency of the driving clock. The
M68HC11E Family — Rev. 3.2
MOTOROLA