The MC68HC11K4 and MC68HC11N4 are 16-MHz devices with nonmultiplexed external address and data buses. Each has 24 Kbytes of on-chip ROM or MC68HC11K3, MC68HC11K4 and MC68HC711K4 comprise the series. These MCUs, with a nonmul- tiplexed expanded bus, are characterized by high speed The boot ROMs for the MC68HC11F1, the MC68HC711K4, and the MC68HC11K4 allow additional choices of baud rates for bootloader communications. New additions to the family of peripherals available on MC68HC11 microcontrollers are pulse width modulation (PWM) timer channels that may be used to CLK4X PAREN NOSEC NOCOP ROMON EEON. $0000. MC68HC11K3. ROMAD. . CLK4X PAREN NOSEC NOCOP ROMON EEON. $0000. MC68HC11K4 .