General Description
Introduction
The MC68HC912B32, MC68HC12BE32 and MC68HC(9)12BC32, are 16-bit microcontroller units (MCUs) composed of standard on-chip peripherals. The multiplexed external bus can also operate in an 8-bit narrow mode for interfacing with single 8-bit wide memory in lower-cost systems.

Features
Features include:
• 16-bit CPU12:
   – Upwardly compatible with the M68HC11 instruction set
   – Interrupt stacking and programmer’s model identical to the M68HC11
   – 20-bit arithmetic logic unit (ALU)
   – Instruction queue
   – Enhanced indexed addressing
   – Fuzzy logic instructions
• Multiplexed bus:
   – Single chip or expanded
   – 16-bit by 16-bit wide or 16-bit by 8-bit narrow modes
• Memory:
   – 32-Kbyte FLASH electrically erasable, programmable read-only memory (EEPROM) with 2-Kbyte erase-protected boot block — MC68HC912B32 and MC68HC912BC32 only
   – 32-Kbyte ROM — MC68HC12BE32 and MC68HC12BC32 only
   – 768-byte EEPROM
   – 1-Kbyte random-access memory (RAM) with single-cycle access for aligned or misaligned read/write
• 8-channel, 10-bit analog-to-digital converter (ATD)
• 8-channel standard timer module (TIM) — MC68HC912B32 and MC68HC(9)12BC32 only:
   – Each channel fully configurable as either input capture or output compare
   – Simple pulse-width modulator (PWM) mode
   – Modulus reset of timer counter
• Enhanced capture timer (ECT) — MC68HC12BE32 only:
   – 16-bit main counter with 7-bit prescaler
   – Eight programmable input capture or output compare channels; four of the eight input captures with buffer
   – Input capture filters and buffers, three successive captures on four channels, or two captures on four channels with a capture/compare selectable on the remaining four
   – Four 8-bit or two 16-bit pulse accumulators
   – 16-bit modulus down-counter with 4-bit prescaler
   – Four user-selectable delay counters for signal filtering
• 16-bit pulse accumulator:
   – External event counting
   – Gated time accumulation
• Pulse-width modulator (PWM):
   – 8-bit, 4-channel or 16-bit, 2-channel
   – Separate control for each pulse width and duty cycle
   – Programmable center-aligned or left-aligned outputs
• Serial interfaces:
   – Asynchronous serial communications interface (SCI)
   – Synchronous serial peripheral interface (SPI)
   – J1850 byte data link communication (BDLC), MC68HC912B32 and MC68HC12BE32 only
   – Controller area network (CAN), MC68HC(9)12BC32 only
• Computer operating properly (COP) watchdog timer, clock monitor, and periodic interrupt timer
• Slow-mode clock divider
• 80-pin quad flat pack (QFP)
• Up to 63 general-purpose input/output (I/O) lines
• Single-wire background debug mode (BDM)
• On-chip hardware breakpoints