1.1 S3C8/S3F8 Series Microcontrollers

Zilog's S3C8/S3F8 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. Important CPU features include:

• Efficient register-oriented architecture

• Selectable CPU clock sources

• Idle and Stop power-down mode release by interrupt

• 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 S3F8S28/S3F8S24 Microcontroller

The S3F8S28/S3F8S24 single-chip CMOS micro-controller is fabricated using a highly advanced CMOS process

and is based on Zilog's newest CPU architecture. Its design is based on the powerful SAM8RC CPU core. Stop

and idle (power-down) modes were implemented to reduce power consumption.

The S3F8S28/S3F8S24 is a micro-controller with 8K/4Kbyte multi-time-programmable Flash ROM embedded.

Using the SAM8RC design approach, the following peripherals were integrated with the powerful core:

• Three configurable I/O ports (22 pins)

• 18 interrupt sources with 18 vectors and 8 interrupt levels

• A 16-bit Timer 0 with one 16-bit timer or two 8-bit timer mode.

• A 16-bit Timer 1 with interval & Capture function.

• A free running Watchdog Timer with interrupt and Reset.

• Analog to digital converter with thirteen input channels (MAX.) and 12-bit resolution

• One UART module

• One IIC module

• Two PWM outputs with three optional mode: 12-bit (6 + 6); 8-bit (6 + 2); 14-bit (8 + 6);

The S3F8S28/S3F8S24 microcontroller is ideal for use in a wide range of electronic applications requiring simple

timer/counter, PWM, ADC. S3F8S28/S3F8S24 is available in a 24/20-pin SOP Package and a 24-pin TSSOP

package and a 20-pin DIP package.

1.3 Features

• CPU

− SAM8RC CPU core

• Memory

− Internal multi-time program Full-Flash memory:

8K  8 bits program memory (S3F8S28)

4K  8 bits program memory (S3F8S24)

o Sector size: 128 bytes

o User programmable by LDC instruction

o Sector erase available

o Fast programming time

o External serial programming support

o Endurance: 10,000 erase/program cycles

o 10 Years data retention

− 272byte general-purpose register area

• Instruction Set

− 78 instructions

− Idle and Stop instructions added for power-down modes

• Instruction Execution Time

− 333ns at 12MHz fOSC (minimum)

• Interrupts

− 8 interrupt levels and 17 interrupt sources (8 external interrupt and 9 internal interrupt)

− Fast interrupt processing feature

− Watchdog interrupt can release Stop Mode.

• General I/O

− Three I/O ports (Max. 22 pins)

− Bit programmable ports

• 2-ch High-speed PWM with Three Selectable Resolutions

− 12-bit PWM: 6-bit base + 6-bit extension

− 8-bit PWM: 6-bit base + 2-bit extension

− 14-bit PWM: 8-bit base + 6-bit extension