Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario descargar pdf (Pagina 12)

SH7080 Group

A/D Conversion in Single-cycle Scan Mode

REJ06B0699-0100/Rev.1.00 January 2008 Page 10 of 19

5. Description of Software

5.1 List of Functions

The functions of this sample application are listed below.

Table 4 List of Functions

Function Name Description

main() Initializes A/D converter module 0 and calls the A/D conversion routine.

ad_conv() Starts A/D conversion and stores the results of conversion in the on-chip RAM.

5.2 Variables Used

The variables used in this sample application are listed below.

Table 5 List of Variables

Variable/Label Name Description

Referring

function

Unsigned short Ad_data[AD][CH] Array (2 bytes) for storing A/D-converted data.

AD indicates the number of rounds of A/D conversion, i.e.

3 in this sample application.

CH indicates the number of channels, i.e. 4 in this sample

application.

ad_conv()

Unsigned char ad_count A/D conversion counter ad_conv()

Unsigned char ch_count A/D conversion channel number counter ad_conv()

5.3 Section Assignment

Section assignment for this sample application is as follows.

Table 6 Section Assignment

Address Section Name Description

H'00000000 DVECTTBL, DINTTBL,

PIntPRG

DVECTTBL: Exception vector table

DINTTBL: Interrupt vector table

PIntPRG: Interrupt program

H'00000800 PResetPRG Reset program

H'00001000 P, C$BSEC, C$DEC, D P: Program area

C$BSEC: Stores an address for B section initialization.

C$DEC: Stores an address for D section initialization.

D: Stores data.

H'FFFF4000 B, R B: uninitialized data area

R: initialized data

H'FFFFBC00 S Stack area

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 20 21

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Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario Pagina 12