
Operating Modes and On-Chip Memory
Data Sheet
M68HC11E Family — Rev. 5
52
Operating Modes and On-Chip Memory
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MOTOROLA
ADPU — Analog-to-Digital Converter Power-Up Bit
Refer to 
Section 3. Analog-to-Digital (A/D) Converter
. 
CSEL — Clock Select Bit
Selects alternate clock source for on-chip EEPROM charge pump. Refer to 
2.5.1 EEPROM and CONFIG Programming and Erasure
 for more information 
on EEPROM use. 
CSEL also selects the clock source for the A/D converter, a function discussed 
in 
Section 3. Analog-to-Digital (A/D) Converter
. 
IRQE — Configure IRQ for Edge-Sensitive Only Operation Bit
Refer to 
Section 5. Resets and Interrupts
. 
DLY — Enable Oscillator Startup Delay Bit
0 = The oscillator startup delay coming out of stop mode is bypassed and the 
MCU resumes processing within about four bus cycles. 
1 = A delay of approximately 4000 E-clock cycles is imposed as the MCU is 
started up from the stop power-saving mode. This delay allows the 
crystal oscillator to stabilize. 
CME — Clock Monitor Enable Bit
Refer to 
Section 5. Resets and Interrupts
. 
Bit 2 — Not implemented 
Always reads 0 
CR[1:0] — COP Timer Rate Select Bits 
The internal E clock is divided by 2
15
 before it enters the COP watchdog system. 
These control bits determine a scaling factor for the watchdog timer. Refer to 
Section 5. Resets and Interrupts
. 
2.4  EPROM/OTPROM 
Certain devices in the M68HC11 E series include on-chip EPROM/OTPROM. For 
instance:
The MC68HC711E9 devices contain 12 Kbytes of on-chip EPROM 
(OTPROM in non-windowed package). 
The MC68HC711E20 has 20 Kbytes of EPROM (OTPROM in 
non-windowed package). 
The MC68HC711E32 has 32 Kbytes of EPROM (OTPROM in 
non-windowed package).
Standard MC68HC71E9 and MC68HC711E20 devices are shipped with the 
EPROM/OTPROM contents erased (all 1s). The programming operation programs 
zeros. Windowed devices must be erased using a suitable ultraviolet light source 
before reprogramming. Depending on the light source, erasing can take from 15 to 
45 minutes.
F
Freescale Semiconductor, Inc.
n
.