1.1 S3C8-Series Microcontrollers
Zilog's S3C8 series of 8-bit single-chip CMOS microcontrollers offers a fast and efficient CPU, a wide range of
integrated peripherals, and various mask-programmable ROM sizes. Among the major CPU features are:
• Efficient register-oriented architecture
• Selectable CPU clock sources
• Idle and Stop power-down mode release by interrupts
• Built-in basic timer with watchdog function
A sophisticated interrupt structure recognizes up to eight interrupt levels. Each level can have one or more
interrupt sources and vectors. Fast interrupt processing (within a minimum of four CPU clocks) can be assigned to
specific interrupt levels.
1.2 S3F8S7B Microcontroller
The S3F8S7B single-chip CMOS microcontrollers are fabricated using the highly advanced CMOS process, based
on Zilog’s newest CPU architecture.
The S3F8S7B is a microcontroller with a 64KB Flash ROM embedded.
Using a proven modular design approach, Zilog engineers have successfully developed the S3F8S7B by
integrating the following peripheral modules with the powerful SAM8 core:
• Nine programmable I/O ports, including eight 8-bit ports, and one 6-bit port, for a total of 70 pins
• Sixteen bit-programmable pins for external interrupts
• One 8-bit basic timer for oscillation stabilization and watchdog functions (system reset)
• Four 8-bit timer/counter and two 16-bit timer/counter with selectable operating modes
• Watch timer for real time
• LCD Controller/driver
• A/D converter with 8 selectable input pins
• D/A converter with 1 selectable output pin
• Synchronous SIO modules
• Two asynchronous UART modules
• Pattern generation module

1.3 Features
CPU
• SAM88 RC CPU core
Memory
• Program Memory (ROM)
− 64K × 8 bits program memory
− Internal Flash memory (program memory)
o Sector size: 128 bytes
o 10 years data retention
o Fast programming time: User program and sector erase available
o Endurance: 10,000 erase/program cycles
o External serial programming support
o Expandable OBPTM (on board program) sector
• Data Memory (RAM)
− Including LCD display data memory
− 2,114 × 8 bits data memory
Instruction Set
• 78 instructions
• Idle and stop instructions added for power-down modes
70 I/O Pins
• I/O: 18 pins (Sharing with other signal pins)
• I/O: 52 pins (Sharing with LCD signal outputs)
Interrupts
• 8 interrupt levels and 31 interrupt sources
• Fast interrupt processing feature
8-Bit Basic Timer
• Watchdog timer function
• 4 kinds of clock source