The MCF51AC family, comprised of pin-compatible 8-bit and 32-bit device duos, is the third family in the Flexis series. The Flexis series of controllers is the connection point on the Freescale Controller Continuum, where 8- and 32-bit compatibility becomes reality. The MCF51AC256/128 device extends the low end of the 32-bit ColdFire controller family with up to 256 KB flash memory, a controller area network (CAN) module, a 16-bit FlexTimer module, 24-channel, 12-bit analog-to-digital converter (ADC) and delivers up to 25 MHz in bus frequency. The 32-bit MCF51AC256/128 is pin-, peripheral- and tool-compatible with the 8-bit S08AC128/96/60/48/32 devices. They share a common set of peripherals and development tools to deliver the ultimate in migration flexibility.V1 ColdFire core with background debug moduleUp to 256 KB of flash memoryUp to 32 KB of static RAM (SRAM)Up to two analog comparators (ACMP)ADC with up to 24 channelsCANCyclic redundancy check (CRC)Inter-integrated circuit (IIC)Keyboard interrupt (KBI)Multipurpose clock generator (MCG)Rapid general-purpose input/output (RGPIO)Two serial communications interfaces (SCI)Up to two serial peripheral interfaces (SPI)Two flexible timer modules (FTM)Timer pulse-width modulator (TPM)