INTRODUCTION
The MC68HC11PH8 8-bit microcontroller is a member of the M68HC11 family of HCMOS microcontrollers. In addition to 48K bytes of ROM, the MC68HC11PH8 contains 2K bytes of RAM and 768 bytes of EEPROM. Making use of an 84-pin PLCC, or 112-pin TQFP package, a non-multiplexed expanded bus is a feature of this device. The timer system has been expanded to include three input captures, four output compares and a software selectable input capture or output compare. There are three 8-bit modulus timers, one of which may be used as a prescaler for the other two. The inclusion of a PLL circuit allows power consumption and performance to be adjusted to suit operational requirements. Other major features of this device are: 8-channel, 8-bit A/D converter, four PWM timer channels, wired-OR capability for keyboard interrupt, four LCD segment drivers and two SPI and two enhanced SCI subsystems. The MC68HC11PH8 is especially suitable for mobile communications and automotive applications.

FEATUREs
• Low power, high performance M68HC11 CPU core
• 48K bytes of user ROM (MC68HC11PH8); 48K bytes of user EPROM (MC68HC711PH8)
• 2K bytes of RAM
• 768 bytes of byte-erasable user EEPROM, with on-chip charge pump
• Up to 54 general purpose I/O lines, plus up to 8 input-only lines
• Non-multiplexed address and data buses, permitting direct access to the full 64K address map
• 16-bit timer with 3/4 input captures and 4/5 output compares; pulse accumulator and COP watchdog timer
• Three 8-bit modulus timers, for generating periodic interrupts
• Power saving PLL circuit
• Wired-OR interrupt capability for keyboard support, allowing wake-up from STOP and WAIT modes
• Two 8- or 9-bit SCI subsystems, one with MI BUS† capability; both NRZ type for RS232 compatibility
• Two SPI subsystems, with software selectable MSB/LSB first option
• 8-channel, 8-bit analog-to-digital (A/D) converter
• Four 8-bit PWM timer channels (may be concatenated to form one or two 16-bit channels)
• 4-segment LCD driver
• Available in 84-pin PLCC or 112-pin TQFP packages (MC68HC11PH8); also 84-pin CERQUAD package (MC68HC711PH8)