1.1. S3F8S45 Microcontroller
The S3F8S45 MCU features 16 KB of Flash ROM. Using a proven modular design
approach, the S3F8S45 MCU was developed by integrating the following peripheral modules with the SAM88 core:
• Five programmable I/O ports, including three 8-bit ports and two 7-bit ports for a total
of 38 pins
• Eight bit-programmable pins for external interrupts
• One 8-bit basic timer for oscillation stabilization and watchdog functions (system reset)
• Three 8-bit timer/counters and two 16-bit timer/counters with selectable operating modes
• Watch timer for real time
• LCD controller/driver
• A/D converter with 9 selectable input pins
• Synchronous SIO modules
• Two asynchronous UART modules
• Pattern generation module
• Battery level detector
The S3F8S45 MCU is currently available in 44-pin QFP, 42-pin SDIP, and 32-pin SDIP
packages.

Features
The S3F8S45 MCU offers the following features:
• SAM88 RC CPU core
• Program memory (full Flash ROM):
– 16K x 8 bits program memory
– Internal Flash (program) memory
○ Sector size: 128 bytes
○ 10 years data retention
○ Fast programming time; user program and sector erase available
○ Endurance: 10,000 erase/program cycles
○ External serial programming support
○ Expandable On-Board Program (OBP) sector
• Data memory (RAM)
– LCD display data memory
– 528 x 8 bits data memory
• Instruction set
– 78 instructions
– IDLE and STOP instructions added for power-down modes
• 38 I/O pins
– 8 pins shared with other signal pins
– 30 pins shared with LCD signal outputs
• Interrupts
– 8 interrupt levels and 22 interrupt sources
– Fast interrupt processing feature
• 8-bit basic timer
– Watchdog timer function
• 2 watchdog timer clock sources:
– Basic timer
– 32 kHz internal RC oscillator, selectable by the Smart Option
• 8-bit Timer/Counter A:
– Programmable 8-bit internal timer
– External event counter function
– PWM and capture function