R8C18 datasheet(12/257 Pages) RENESAS

12 / 257 page

A - 5

15.2

Clock Asynchronous Serial I/O (UART) Mode ........................................157

15.2.1

CNTR0 Pin Select Function..............................................................160

15.2.2

Bit Rate.............................................................................................161

15.3

Notes on Serial Interface.........................................................................162

16. Comparator

163

16.1

One-Shot Mode .......................................................................................167

16.2

Repeat Mode...........................................................................................169

16.3

Notes on Comparator ..............................................................................171

17. Flash Memory Version

172

17.1

Overview .................................................................................................172

17.2

Memory Map ...........................................................................................174

17.3

Functions to Prevent Rewriting of Flash Memory....................................176

17.3.1

ID Code Check Function ..................................................................176

17.3.2

ROM Code Protect Function ............................................................177

17.4

CPU Rewrite Mode..................................................................................178

17.4.1

EW0 Mode........................................................................................179

17.4.2

EW1 Mode........................................................................................179

17.4.3

Software Commands ........................................................................188

17.4.4

Status Register .................................................................................192

17.4.5

Full Status Check .............................................................................193

17.5

Standard Serial I/O Mode........................................................................195

17.5.1

ID Code Check Function ..................................................................195

17.6

Parallel I/O Mode.....................................................................................199

17.6.1

ROM Code Protect Function ............................................................199

17.7

Notes on Flash Memory Version .............................................................200

17.7.1

CPU Rewrite Mode...........................................................................200

18. Electrical Characteristics

202

19. Usage Notes

217

19.1

Notes on Clock Generation Circuit ..........................................................217

19.1.1

Stop Mode and Wait Mode ...............................................................217

19.1.2

Oscillation Stop Detection Function..................................................217

19.1.3

Oscillation Circuit Constants.............................................................217

19.1.4

High-Speed On-Chip Oscillator Clock ..............................................217

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