I am using the 205 pin BGA version of the S12XE with a bus clock of 50 Mhz and the ATD clock at 1 Mhz.
I cannot get the ATD to read values in channels 8 to 15. I have no problem with 0 to 7 channels. Below is my code.
Ray.
void Init_ATD0(void) {
ATD0CTL1 = 0B00110000;
//ETRIGSEL - External Trigger Source Select
//SRES[1:0] - A/D Resolution Select
//SMP_DIS - Discharge Before Sampling Bit
//ETRIGCH[3:0] - External Trigger Channel Select
ATD0CTL2 = 0B01000010;
//Reserved
//AFFC - ATD Fast Flag Clear All
//ICLKSTP - Internal Clock in Stop Mode Bit
//ETRIGLE - External Trigger Level/Edge Control
//ETRIGP - External Trigger Polarity
//ETRIGE - External Trigger Mode Enable
//ASCIE - ATD Sequence Complete Interrupt Enable
//ACMPIE - ATD Compare Interrupt Enable
ATD0CTL3 = 0B11000000;
//DJM - Result Register Data Justification (Right Justified)
//S8C, S4C, S2C, S1C - Converison Sequence Length (8)
//FIFO - Result Register FIFO Mode (0)
//FRZ[1:0] - Background Debug Freeze Enable (Finish current converison, then freeze)
ATD0CTL4 = 0B01011111;
//SMP[2:0] - Sample Time Select (8)
//PRS[4:0] - ATD Clock Prescaler (ATD clock 1MHz with 50 MHz bus)
ATD0CTL5 = 0B00110000;//start continuous conversion
//Reserved
//SC - Special Channel Conversion Bit
//SCAN - Continuous or Single conversion sequence (Continuous)
//MULT - Multi-Channel Sample Mode (multichannel)
//CD, CC, CB, CA - Analog Input Channel Select Code (channel AN0)
}
#define ADC_ARRAY 18
volatile uint16_t adcVal[ADC_ARRAY];
//-------------------------- ATD0 Interrupt ------------------------------
interrupt void ATD0_ISR(void) {
adcVal[0] = ATD0DR0;
adcVal[1] = ATD0DR1;
adcVal[2] = ATD0DR2;
adcVal[3] = ATD0DR3;
adcVal[4] = ATD0DR4;
adcVal[5] = ATD0DR5;
adcVal[6] = ATD0DR6;
adcVal[7] = ATD0DR7;
adcVal[8] = ATD0DR8;
adcVal[9] = ATD0DR9;
adcVal[10] = ATD0DR10;
adcVal[11] = ATD0DR11;
adcVal[12] = ATD0DR12;
adcVal[13] = ATD0DR13;
adcVal[14] = ATD0DR14;
adcVal[15] = ATD0DR15;
}
