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Introduction

The MC68HC912D60A microcontroller unit (MCU) is a 16-bit device available in two package options, 80-pin QFP and 112-pin TQFP. On chip peripherals include a 16-bit central processing unit (CPU12), 60K bytes of flash EEPROM, 2K bytes of RAM, 1K bytes of EEPROM, two asynchronous serial communication interfaces (SCI), a serial peripheral interface (SPI), an enhanced capture timer (ECT), two (one on 80QFP) 8-channel,10-bit analog-to-digital converters (ATD), a four-channel pulse-width modulator (PWM), and a CAN 2.0 A, B software compatible module (MSCAN12). System resource mapping, clock generation, interrupt control and bus interfacing are managed by the lite integration module (LIM). The MC68HC912D60A has full 16-bit data paths throughout, however, the external bus can operate in an 8-bit narrow mode so single 8-bit wide memory can be interfaced for lower cost systems. The inclusion of a PLL circuit allows power consumption and performance to be adjusted to suit operational requirements. In addition to the I/O ports available in each module, 16 (2 on 80QFP) I/O port pins are available with Key-Wake-Up capability from STOP or WAIT mode.

Features

? 16-bit CPU12

– Upward compatible with M68HC11 instruction set

– Interrupt stacking and programmer’s model identical to M68HC11

– 20-bit ALU

– Instruction queue

– Enhanced indexed addressing

? Multiplexed bus

– Single chip or expanded

– 16 address/16 data wide or 16 address/8 data narrow mode

? Two 8-bit ports with key wake-up interrupt (2 pins only are available on 80QFP) and one I2C start bit detector (112TQFP only)

? Memory

– 60K byte flash EEPROM, made of a 28K module and a 32K module with 8K bytes protected BOOT section in each module (MC68HC912D60A)

– 1K byte EEPROM

– 2K byte RAM

? Analog-to-digital converters

– 2 x 8-channels, 10-bit resolution in 112TQFP

– 1 x 8-channels, 8-bit resolution in 80QFP

? 1M bit per second, CAN 2.0 A, B software compatible module

– Two receive and three transmit buffers

– Flexible identifier filter programmable as 2 x 32 bit, 4 x 16 bit or 8 x 8 bit

– Four separate interrupt channels for Rx, Tx, error and wake-up

– Low-pass filter wake-up function

– In 80QFP, only TxCAN and RxCAN pins are available

– Loop-back for self test operation

– Programmable link to a timer input capture channel, for time stamping and network synchronization.

? Enhanced capture timer (ECT)

– 16-bit main counter with 7-bit prescaler

– 8 programmable input capture or output compare channels; 4 of the 8 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

? 4 PWM channels with programmable period and duty cycle

– 8-bit 4-channel or 16-bit 2-channel

– Separate control for each pulse width and duty cycle

– Center- or left-aligned outputs

– Programmable clock select logic with a wide range of frequencies

? Serial interfaces

– Two asynchronous serial communications interfaces (SCI)

– MI-Bus implemented on final devices

– Synchronous serial peripheral interface (SPI)

? LIM (light integration module)

– WCR (windowed COP watchdog, real time interrupt, clock monitor)

– ROC (reset and clocks)

– MEBI (multiplexed external bus interface)

– MBI (internal bus interface and map)

– INT (interrupt control)

? Clock generation

– Phase-locked loop clock frequency multiplier

– Limp home mode in absence of external clock

– Slow mode divider

– Low power 0.5 to 16 MHz crystal oscillator reference clock

– Option of a Pierce or Colpitts oscillator

? 112-Pin TQFP package or 80-pin QFP package

– Up to 68 general-purpose I/O lines, plus up to 18 input-only lines in 112TQFP or Up to 48 general-purpose I/O lines, plus up to 10 input-only lines in 80QFP

? 8MHz operation at 5V

? Development support

– Single-wire background debug? mode (BDM)

– On-chip hardware breakpoints