The 68HC11E family MCUs all combine the M68HC11 CPU with high-performance, on-chip peripherals. The E series is comprised of many devices with various configurations of RAM, ROM or EPROM, and EEPROM. Several low-voltage devices are also available. With the exception of a few minor differences, the operation of all E-series MCUs is identical. A fully static design and high-density complementary metal-oxide semiconductor (HCMOS) fabrication process allow E-series devices to operate at frequencies from 3 MHz to dc.

• Power Saving STOP and WAIT Modes  
• 512 Bytes of On-Chip RAM, Data Retained During Standby
• 512 Bytes of On-Chip EEPROM
• Asynchronous Nonreturn to Zero (NRZ) Serial Communications Interface (SCI)
• Synchronous Serial Peripheral Interface (SPI)
• 8-Channel 8-Bit Analog-to-Digital (A/D) Converter
• 16-Bit Timer System
  • Three Input Capture (IC) Channels
  • Four Output Compare (OC) Channels
  • One Additional Channel, Selectable as Fourth IC or Fifth OC
• 38 IO Pins (addressable external memory)
• PLCC52 Package

For the 68HCP11E1 device Freescale website go here,

 You can also find very interesting information  and free software for the HC11 family of products here