MEMORY ORGANIZATION
PROGRAM MEMORY: Up to 16 Kbytes of the program memory can reside in the on-chip EPROM. The device can also address up to 64K of program memory external to the chip.

■ Extended Automotive Temperature
   Range (b40§C to a125§C Ambient)
■ High Performance CHMOS EPROM
■ Three 16-Bit Timer/Counters
■ One-to-Three Level Program/Data Lock System
■ 16K On-Chip EPROM/ROM
■ 256 Bytes of On-Chip Data RAM
■ Quick Pulse Programming Algorithm
■ Boolean Processor
■ 32 Programmable I/O Lines
■ 7 Interrupt Sources
■ Programmable Serial Channel with:
   — Framing Error Detection
   — Automatic Address Recognition
■ TTL and CMOS Compatible Logic Levels
■ 64K External Program Memory Space
■ 64K External Data Memory Space
■ MCSÉ-51 Compatible Instruction Set
■ Power Saving Idle and Power Down Modes
■ ONCE (On-Circuit Emulation) Mode
■ RFI Reduction Mode
■ Available in 12 MHz, 16 MHz and 20 MHz Versions
■ Available in PLCC and DIP Packages