Introduction

Designed for automotive multiplexing applications, members of the MC9S12DB-Family of 16 bit Flash-based microcontrollers are fully pin compatible and enable users to choose between different memory and peripheral options for scalable designs. All MC9S12DB-Family members are composed of standard on-chip peripherals including a 16-bit central processing unit (CPU12), up to 128K bytes of Flash EEPROM, 8K bytes of RAM, 2K bytes of EEPROM, two asynchronous serial communications interfaces (SCI), up to two serial peripheral interfaces (SPI), an enhanced capture timer (ECT), two 8- channel, 10-bit analog-to-digital converters (ADC), an eight-channel pulsewidth modulator (PWM), Byteflight interface and up to two CAN 2.0 A, B software compatible modules (MSCAN12). System resource mapping, clock generation, interrupt control and bus interfacing are managed by the system integration module (SIM). The MC9S12DB-Family 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, up to 22 I/O ports are available with Wake-Up capability from STOP or WAIT mode.