ST AN1526 Application note

AN1526

APPLICATION NOTE

ST7FLITE0 QUICK REFERENCE NOTE

by Microcontroller Division Applications

INTRODUCTION

The ST7FLITE0 extends the lower end of the ST7 range, designed to fit applications with state-of-the-art features in a very small package.

ST7FLITE0 8-bi t MCUs have man y cost-sa ving features and they come w ith low-cost tool s, providing a complete package to reduce both design and final appl ication costs to the absolute minimum.

This application note highlights some small but very important aspects of the ST7FLITE0 that users should not overlook when reading the datasheet.

Sections 2 and 3 contain helpful pointers and a table to help you star t working with ST7FLITE0 and its related tools.

Table 1. ST7Lite0 Features

Program memory RAM

Data EEPROM Package

Number of I/O pi ns Vdd ra nge Temperature range IDDmax in RUN mode LVD

Clock sources

A/D

Timers Communication peripheral Special features

1.5

Kbytes Flash (single voltage)

128 bytes ST7FLITE05: no Data EEPROM

ST7FLITE09: 128 bytes Data EEPROM SO16 (.150) or DIP16 13 (including 6 high current pins)

2.4V - 5.5V

-40°C to +85°C 5mA 3 levels (Standard) Internal RC (1MHz) +/- 1%

PLLx4 (2.4V<V PLLx8 (3.3V<V

8 bits with fixed gain - Op-Amp 5 channels

Autoreload Timer: 1 12-bit PWM channel, Output Compare function Lite Timer: Watchdog, Real Time Clock, Input Capture functions

SPI Read-out protection, In-Circuit Programmming (ICP), In Application Programming

(IAP)

<3.3V)

<5.5V)

AN1526/0503 1/26

Table of Contents

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1 ST7FLITE0 KEY A DVANTAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 LOW-COST 8-BIT MICROCONTROLLER SOLUTION . . . . . . . . . . . . . . . . . . . . 3

1.2 AREA OP TIMIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 HIGH ACCURACY INTERNAL 1MHZ RC OSCILLATOR . . . . . . . . . . . . . . . . . . 4

1.4 8-BIT A/D CONVERTER WITH INPUT VOLTAGE AM PLIFIER (X8) . . . . . . . . . 4

1.5 TRUE E2PROM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.6 SAFE PROTECTION AGAINST PIRACY ON DATA E2PROM AND FLASH . . . 5

1.7 IN-C I RCUIT P RO GRAMMI NG AND IN-APPLICATIO N PROG RAMMING CAPABILITIES 6

2 ST7LITE0 DEVELOPMENT TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 SOFTWAR E TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1.1 ST7 Visual Debug IDE - Reference: STVD7 . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1.2 STVD7 Simu lator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1.3 C Compiler toolchains from Cosmic and Metrowerks . . . . . . . . . . . . . . . . . 7

2.1.4 ST7 Visual Programmer - Reference: STVP7 . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 HARDWARE TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2.1 In-Circuit Debugging Kit - Reference: ST7FLITE 0-IND ART . . . . . . . . . . . . 8

2.2.2 ST Emulator - Reference: ST7MDT10-EMU3 . . . . . . . . . . . . . . . . . . . . . . . 8

2.2.3 ST Programming tool - Refer ence: ST7MDT10-EPB . . . . . . . . . . . . . . . . . 9

2.2.4 ST Graphic Design and Debug - Reference: STREALIZER-II . . . . . . . . . . . 9

3 START TODAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4 ST7FLITE0 8-BIT MCU - EASY REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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ST7FLITE0 QUICK REFERENCE NOTE

1 ST7FLITE0 KEY AD VAN T AG ES

1.1 LOW-COST 8-BIT MICROCONTROLLER SOLUTION

The ST7FLITE0 is a small low-cost microcontroller, embedding many analog functions. It therefore allows you to save board area and the cost of external components. There is no need for:

- external ceramic resonator for accurate oscillators (see 3.2)

- external E

- external reset circ uitry

- external LVD circuitry

- PCB rework for SW update

- large PCB

1.2 AREA OPTIMIZATION

data (see 3.4)

ST7FLITE0 gives you the choice of two small 16-p in packa ges. Yo u can take adva ntage of this to save area on your PCB.

SO16: 6x9.9mm DIP16:10.92x19.18mm

ST7FLITE0 actual-size footprint of 16-Pin SO Package - Typical: 6mm wide, 9.9mm long

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ST7FLITE0 QUICK REFERENCE NOTE

1.3 HIGH ACCURACY INTERNAL 1MHZ RC OSCILLATOR

The ST7Fl ite0 con tains a n i nter nal RC osc illator with a n a ccur acy of 1% for a give n d evice, temperature and voltage. It must be calibrated to obtain the frequency required in the application. This is done by software writing a calibration value in the RCCR (RC Control Register).

Whenever the ST7FLITE0 microcontroller is reset, the RCCR returns to its default value (FFh), i.e. each time the device is reset, the calibration value must be loaded in the RCCR.

Predefined calibration values are stored in E

PROM for 3.0 and 5V VDD suppl y voltages at

25°C, as shown in the following table.

RCCR Conditions

=5V

=25°C

RCCR0

RCCR1

fRC =1MHz

=3V

=25°C

fRC =700kHz

ST7FLITE09

Address

1000h and

FFDEh

1001h and

FFDFh

ST7FLITE05

Address

FFDEh

FFDFh

If the voltage or temperature conditions change in the application, the frequency may need to be recalibrated.

Refer to AN1324 “Calibrating The RC Oscillator of the ST7FLITE0 MCU using the Mains

”

for information on how to calibrate the RC frequency using an external reference signal.

Decoupling capacitor f or stab le oscillator

Vdd and Gnd levels impact the stability of the 1% internal RC of the ST7FLITE0. To reach the most stable oscillation, use decoupling capacitors between Vdd and Gnd pins, at values recommended in the datasheet.

RCCR calibration locations can be W rite Protected The STVP or InDART tools allow you to prevent uni ntentional write acc ess to the RCCR cali-

bration locations.

1.4 8-BIT A/D CONVERTER WITH INPUT VOLTAGE AMPLIFIER (X8)

The 8-bit A/D converter allows up to 5 channels with multiplexed inputs. You can take advantage of its internal fixed-gain amplifier (x8) for zooming on low voltage in-

puts. For Vd d=5V , the AD C can the refore c onver t from 0V to 250mV . In this case the ADC ideal resolution is 2.4mV, equivalent to a 11-bit resolution with input range from 0V to Vdd.

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ST7FLITE0 QUICK REFERENCE NOTE

1.5 TRUE E2PROM DATA

The ST7FLITE09 contains an Electrically Erasable Programmable Read-Only Memory which can be used as a non volatile back-up for storing data. It allows up to 300K Write/Erase cycles at 25°C.

Main Features

- Up to 32 Bytes programmed in the same cycle

- mono-voltage EEPROM (charge pump)

- Chained erase and programming cycles

- Internal control of the global programming cycle duration

- WAIT mode management

- Read-out protection against piracy

Useful Tips: ST7FLITE05: Emulate Data E2PROM wit h p rogram area

For devices with no Data E2PROM, you can emulate Data EEPR OM with the XFlash Memory. For more information, refer to: AN1477: Emulated Data EEP ROM with XFlash memory

1.6 SAFE PROTECTION AGAINST PIRACY ON DATA E2PROM AND FLASH

Data stored in the E

PROM memory, as well as the pr ogram memo ry, are protected against read-out piracy. This is managed by the option bit “Read-out protection”. Removing this option by erasing the option byte will cause the whole memory to be erased first.

Flash program mem ory can also be protected aga inst re-w rite opera tion by opti on bit “Flash Write protection”. When this option is selected, the program memory can never be erased or programmed again.

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ST7FLITE0 QUICK REFERENCE NOTE

1.7 IN-C IRCUI T PROGR AMMING AN D IN- APPLICAT ION P ROGRAMMING CAPABI LITIES

In addition to using a programming tool, the two follow ing modes allow you to program your ST7LITE0 without removing it from your PCB.

ICP: In-Circuit-Programming: The ICP is the ability to program the Flash memory (FLASH sectors 0 and 1, option byte row and data EEPROM) of a microcontroller using ICC (In-Circuit Communication) protocol while the device is already plugged-in to the application, but application is not running.

IAP: In-Application-Pro gramm ing: The IAP is the ability to re-progra m the FLAS H memor y (FLASH sector 1 and data EEPROM) of a microcontroller while the device is al ready pl uggedin to the application and the application is running. As sector 0 contains the software driver to be able to re-program, it is write protected, therefore not reprogrammable.

In ICP minimum configuration, only 3 wires are needed (ICCCLK, ICCDATA, RESET user may also use it as a basis to develop its own debugging tool.

Programm ing time:

ICP allows 1kbytes to be programmed/erased in 160ms. Typical measurements: 1.5k Flash programming time: 315ms For more information, refer to the Programming Manuals: . ST7 Flash Programming Reference Manual . ST7 ICC Protocol Reference Manual

Useful Tips: Sector 0 size configurable by Option Byte

As sector 0 is not re-programmable in IAP programming mode, you may take advantage of configuring its size to optimize Program Memory. By Option Byte, sector 0 size can be set at 0.5 Kbytes, 1 Kbytes, or 1.5 Kbytes.

). The

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ST7FLITE0 QUICK REFERENCE NOTE

2 ST7LITE0 DEVEL OPMENT TOOLS

Table 2 shows a summary of available tools for each function.

Table 2. Available Tools

DEBUG

SIMULATE EMULATE

PROGRAM

STVD7 Simulator

SOFTWARE

no need ST7MDT10-EMU3 ST7FLITE0-INDART no need ST7MDT10-EPB

HARDWARE

STVD7 STVD7 (included in

ST7FLITE0-INDART package)

GRAPHIC

DESIGN &

PROGRAM

DEBUG

ST-REALIZERII STVP7

Note: Third-party C-compiler tool chains can be used with STVD7 interface.

2.1 SOFTWARE TOOLS

2.1.1 ST7 Visual Debug IDE - Reference: STVD7

Visual interface for C or Assembler coding, compile, download and debug with ST7 Emulators or ST7FLITE0-INDART.



Web: http://mcu.st.com

ST7

2.1.2 STVD7 Simulator

Stand-alone tool whi ch al lows to wr ite code, c ompi le, and simul ate an ST 7FLITE0 w ith your PC your ST7FLITE0.



Web: http://mcu.st.com

ST7

2.1.3 C Compiler toolchains from Cosmic and M etrowerks

- Free evaluation version limited to 1K

- Low-cost lite C compiler limited to 8K This compilers can be embedded in STVD7 IDE interface, or used through dedicated graph-

ical interfaces. Web: Cosmic Software Inc.: www.cosmic-software.com Metrowerks: www.metrowerks.com

2.1.4 ST7 Visual Programmer - Reference: STV P7

Visual Interface allowing to program Flash, Data E

PROM, and option bytes. This i s the soft-

ware part of the whole programming tool package. See 4.2.3 for more details.

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ST7FLITE0 QUICK REFERENCE NOTE

2.2 HARDWARE TOOLS

2.2.1 In-Circuit Debugging Kit - Reference: ST7FLITE0-INDART

ST7FLITE0-INDART includes a full-featured experiment board, an in-circuit programming utility, and all tools required to develop custom embedded applications, at low cost. 100% of electrical characteristics are guaranteed by use of a standard chip, not bondout chip.

ST7FLITE0-INDART contains STVD7 graphical interface, C compiler and assembl er. Debugging capabilit ies: Real-time emulation, breakpoints, step capabilities , read/write

memory and registers.

Programming capabilities: Blank-check, Program, Read, Verify Flash, E

PROM memory and

Option Bytes.

Notes:

1. It can be ordered from ST, or directly from Softec. Softec reference: inDART-ST7FLITE0

2. No power supply is delivered with this kit. A typical 5V may be used. Web: http://www.softecmicro.com/indart-st7flite0.html e-mail: info@softecmicro.com

2.2.2 ST Emulator - Reference: ST7MDT10-EMU3

Advanced development tool including:

- Real-time emulator (Advanced breakpoints management (through Bus Event Machine), 256K real-time trace recording, read/write on the fly through Watch and Memory windows, Performance analysis)

- STVD7 User Interface

- Set of probes for Lite family packages.

- Parallel interface cable to PC

- Power Supply Note: the ST Emulator cannot program parts. Therefore, a separate devic e programmer is r e-

quired (as ST7 Programming tool (see 4.2.3))



Web: http://mcu.st.com

ST7

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