The 68HC11 MCU family
The following are Motorola flavors:
HC11 A Series
8K ROM (A8), ROMless (A0,A1), 256 RAM, 512
EEPROM (A1,A8), SPI,
SCI, 3 IC 5 OC, 8 channel 8 bit A/D
HC11
C0
Nice new device developed together with
AT&T. ROMless, on board
bank switching to support memory maps of up
to 256K. Totally
glueless interface - Chip selects on board,
Read Enable and
Write Enable signals now generated on chip.
256 RAM, 8 channel 8
bit A/D - Good pricing
HC11 D Series
Smallest and lowest cost member of the hc11
Family. ROMless (D0),
4K ROM (D3), 4K EPROM (711D3) - No A-D or
EEPROM. Still has
standard timers and serial ports
HC11 E Series
Same as A series execpt 512 bytes RAM and
512 EEPROM (2048 for
E2). Pin compatible, only difference
is one timer pin (PA4) can
now be used for IC or OC instect of just OC.
Also have EPROM
devices and larger memory - hc711e9 (12K
OTP), hc711e20 (20K
OTP)
HC11 F series
ROMless, non
multiplexed address/data bus with 4 chip selects
built in. 1K RAM, 512 bytes EEPROM -
otherwise same peripherals
as E series
HC11 G Series
16K ROM/EPROM, Non
mulitplexed address/data bus, 512 RAM, 4
channel PWM, 10 Bit A/D convertor, 2
separate 16 bit timers
HC11 K4
24K ROM/EPROM, 1Mb
addressing using on chip memory mapping. Non
multiplexed address and data bus. 4
programmable chip selects, 8
channel 8 bit A/D. 4 channel PWM, 768
bytes RAM
Source: http://www.faqs.org/faqs/microcontroller-faq/68hc11/