8 KB Flash and 256 B RAM — sizing the firmware budget
With 8 KB of Flash and 256 bytes of RAM, the MSP430F413IPMR is sized for single-function control loops — think a thermostat with a segment LCD, a flow meter, or a simple data-logger front end. The 256-byte RAM is the tightest constraint: it limits the call stack depth and any buffering. For designs that need more headroom, the MSP430x4xx family scales up to 60 KB Flash and 2 KB RAM in the same 64-LQFP footprint.
Integrated LCD driver — BOM simplification
The on-chip LCD driver supports up to 4-mux or 8-mux segment LCDs, driving the glass directly without an external HT1621 or similar controller. This saves about $0.30 to $0.50 in BOM cost and frees up board area and I/O pins. The driver runs from the internal oscillator or an external low-frequency crystal, and the MCU can enter low-power modes while the LCD refresh continues — a common trick to keep a clock or status display alive at single-digit microamp draw.
At 3.0 V the core draws roughly 300 µA/MIPS in active mode and under 2 µA in standby with the LCD running, though those figures are typical — budget for the worst-case column when sizing the battery.