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