Datasheet

238
2503Q–AVR–02/11
ATmega32(L)
Using this algorithm, the timing constraint on the HOLD signal constrains the TCK clock fre-
quency. 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 92. 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
6Verify 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