Rainbow Electronics ATmega32L - Manual (Page 236)

236
ATmega32(L)
2503C–AVR–10/02
Using this algorithm, the timing constraint on the HOLD signal constrains the TCK clock
frequency. As the algorithm keeps HOLD high for five steps, the TCK clock frequency
has to be at least five times the number of scan bits divided by the maximum hold time,
t
hold,max
.
Table 93. Algorithm for Using the ADC
Step Actions ADCEN DAC MUXEN HOLD PRECH
PA3.
Data PA3.
Control
PA3.
Pullup_
Enable
1 SAMPLE
_PRELO
AD 1 0x200 0x08 1 1 0 0 0
2 EXTEST 1 0x200 0x08 0 1 0 0 0
3 1 0x200 0x08 1 1 0 0 0
4 1 0x123 0x08 1 1 0 0 0
5 1 0x123 0x08 1 0 0 0 0
6 Verify the
COMP bit
scanned
out to be
0 1 0x200 0x08 1 1 0 0 0
7 1 0x200 0x08 0 1 0 0 0
8 1 0x200 0x08 1 1 0 0 0
9 1 0x143 0x08 1 1 0 0 0
10 1 0x143 0x08 1 0 0 0 0
11 Verify the
COMP bit
scanned
out to be
1 1 0x200 0x08 1 1 0 0 0