M32CSLASH86 datasheet(273/505 Pages) RENESAS

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18. A/D Converter

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18.2 Functions

18.2.1 Resolution Select Function

The BITS bit in the AD0CON1 register determines the resolution. When the BITS bit is set to "1" (10-bit

precision), the A/D conversion result is stored into bits 9 to 0 in the AD0j register (j = 0 to 7). When the

BITS bit is set to "0" (8-bit precision), the A/D conversion result is stored into bits 7 to 0 in the AD0j

18.2.2 Sample and Hold Function

When the SMP bit in the AD0CON2 register is set to "1" (with the sample and hold function), A/D conver-

sion rate per pin increases to 28 ØAD cycles for 8-bit resolution and 33 ØAD cycles for 10-bit resolution.

The sample and hold function is available in all operating modes. Start the A/D conversion after selecting

whether the sample and hold function is to be used or not.

18.2.3 Trigger Select Function

The TRG bit in the AD0CON0 register and the TRG0 bit in the AD0CON2 register select the trigger to

start the A/D conversion. Table 18.9 lists settings of the trigger select function.

Table 18.9 Trigger Select Function Settings

Bit and Setting

Trigger

AD0CON0 Register

AD0CON2 Register

TRG = 0

Software trigger

The A/D0 starts the A/D conversion when the ADST bit in the

AD0CON0 register is set to "1"

TRG = 1(1)

TRG0 = 0

External trigger(2)

__________

Falling edge of a signal applied to ADTRG

TRG0 = 1

Hardware trigger(2)

The timer B2 interrupt request of three-phase motor control timer

functions (after the ICTB2 counter completes counting)

NOTES:

1. A/D0 starts the A/D conversion when the ADST bit is set to "1" (A/D conversion started) and a trigger is generated.

2. The A/D conversion is restarted if an external trigger or a hardware trigger is inserted during the A/D conversion.

(The A/D conversion in process is aborted.)

18.2.4 DMAC Operating Mode

DMAC operating mode is available with all operating modes. When the A/D converter is in multi-port

single sweep mode or multi-port repeat sweep mode 0, the DMAC operating mode must be used. When

the DUS bit in the AD0CON3 register is set to "1" (DMAC operating mode enabled), all A/D conversion

results are stored into the AD00 register. DMAC transfers data from the AD00 register to any memory

space every time an A/D conversion is completed in each pin. 8-bit DMA transfer must be selected for 8-

bit resolution and 16-bit DMA transfer for 10-bit resolution. Refer to 13. DMAC for instructions.

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