Here are the details of the R8C/2G and 26-27 groups. Note that there are a few additional blocks in the 26, 27 group. Both options have a 16-bit timer, but the Timer RC in the 26, 27 provides additional features not available in Timer RF. Other key differences are Data Flash, RAM size, and an external main clock. As part of the low-end R8C line-up the R8C/2G has been optimized for cost, while providing adequate functionality and I/O input to output for simpler applications.