Why are Kinetis 12-bit DAC data registers 8-bit long?

schen — Tue, 19 Aug 2014 14:02:29 GMT

The Kinentis 12-bit DAC in devices such as KL25Z or K64F has the data registers defined as two 8-bit registers. The byte ordering is the same as the ARM core little endian. I modified the code to write to the DATL:DATH as a singular 16-bit register and it works just fine. Is there a reason to treat them as two 8-bit registers?

int main(void) {

void DAC0_init(void);

int i;

short* dac0dat = (short*)&(DAC0->DAT[0].DATL);

DAC0_init();

while (1) {

for (i = 0; i < 0x1000; i++) {

// DAC0->DAT[0].DATL = i & 0xff;

// DAC0->DAT[0].DATH = (i >> 8) & 0x0f;

*dac0dat = i;

}

Re: Why are Kinetis 12-bit DAC data registers 8-bit long?

Hui_Ma — Thu, 21 Aug 2014 07:42:34 GMT

I think the DAC module IP original designed for 8-bit MCU products, that's why the register is in 8-bit.

Wish it helps.
best regards
Ma Hui

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topic Re: Why are Kinetis 12-bit DAC data registers 8-bit long? in Kinetis Microcontrollers

Why are Kinetis 12-bit DAC data registers 8-bit long?

Re: Why are Kinetis 12-bit DAC data registers 8-bit long?