ADC 10 User Manual download pdf (Page 16)

ADC10 Operation

27-16 ADC10

One-Block Transfer Mode

The one-block mode is selected if the ADC10TB is reset. The value n in

ADC10DTC1 defines the total number of transfers for a block. The block start

address is defined anywhere in the MSP430 address range using the 16-bit

transfer mode is shown in Figure 27−9.

Figure 27−9. One-Block Transfer

ADC10SA

ADC10SA+2

ADC10SA+2n−2

ADC10SA+2n−4

1st transfer

’n’th transfer

2nd transfer

TB=0

DTC

The internal address pointer is initially equal to ADC10SA and the internal

transfer counter is initially equal to ‘n’. The internal pointer and counter are not

visible to software. The DTC transfers the word-value of ADC10MEM to the

address pointer ADC10SA. After each DTC transfer, the internal address

pointer is incremented by two and the internal transfer counter is decremented

by one.

The DTC transfers continue with each loading of ADC10MEM, until the

internal transfer counter becomes equal to zero. No additional DTC transfers

will occur until a write to ADC10SA. When using the DTC in the one-block

mode, the ADC10IFG flag is set only after a complete block has been

transferred. Figure 27−10 shows a state diagram of the one-block mode.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 31 32

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ADC 10 User Manual Page 16