Renesas Renasas Single-Chip Microcomputer SH7086 Bedienungsanleitung PDF herunterladen (Seite 17)

SH7080 Group

A/D Conversion in Single-cycle Scan Mode

REJ06B0699-0100/Rev.1.00 January 2008 Page 15 of 19

6. Flowchart

A flowchart for this sample application is shown below.

6.1 Main Routine

main ()

ad_conv ()

Initialize A/D

conversion counter

Initialize A/C

conversion

channel numbers

Set the frequency

control register

(FRQCR)

Set the standby

control register 4

(STBGR4)

Set the A/D

Control/Status

(ADCSR_0)

Set the A/D

Control/Status

Internal clock: 80 MHz

Bus clock: 40 MHz

Peripheral clock: 40 MHz

MTU2S clock: 80 MHz

MTU2 clock: 40 MHz

Set MSTP16 of STBCR4 to 0.

[Function]

Supplying clocks to A/D_0.

- Clear the A/D end flag (ADF) to 0.

[Function]

Clearing the A/D end flag.

- Clear the A/D interrupt enable bit (ADIE) to 0.

[Function]

Disabling ADI interrupt.

- Clear the trigger enable bit (TRGE) to 0.

[Function]

Disabling trigger for starting A/D conversion.

- Clear the state control bit (STC) to 0.

[Function]

Setting A/D conversion time to 50 states.

- Set the clock select bits (CKSL) to 00.

[Function]

Setting A/D conversion time to Pφ/4.

- Set the A/D mode bits (ADM) to 01.

[Function]

Setting A/D conversion mode to 4-channel scan mode.

- Clear the A/D continuous scan bit (ADCS) to 0.

[Function]

Setting single-cycle scan mode.

- Set channel select bits (CH) to 011.

[Function]

Setting channels to AN0-AN3.

Clear the A/D start bit (ADST) to 0.

Perform A/D conversion and store the result to the RAM.

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